THIS IS A C PROGRAM. COMPILER IS XCODE.

DECLARE ALL PROTOTYPES, VARIABLES, COMMENTS, ETC.

MY CODE IS NOT WORKING. PLEASE HELP.

Since we dont have a GUI or other means of displaying the contents of a file all at once, lets modify the problem slightly. Rather than locating a specific substring within a file and then highlighting the results, as most modern programs do, lets write a C program that locates the occurrences of a specific substring within a file and then display the occurrence number as well as a portion of the text around the found substring. It should also count the number of occurrences and indicate that in a brief report at the end. Although it should work on any input file and any substring, well provide a copy of an input file to use for testing (i.e., Decl of Indep.txt). Overview

Heres a high level overview of what your program should do:

1) Ask the user for the name of the input file.

a) If the file is not present or cant be opened, display an error message and ask the user to enter another file name.

2) Ask the user for the substring to search for. 3) Calculate and display the found occurrences of the substring in the file. For each found occurrence, your program should display

(a) the location number starting at 1 and going up to the total number of locations found, and

(b) the portion of the string containing the found substring. This portion should consist of the substring and 8 characters before and 8 characters after the found substring.

Sample Runs Here is a sample run looking for the string people in the file Decl of Indep.txt.

Looking for the substring "people" in file "Decl of Indep.txt":

Location 1: String: "for one people to"

Location 2: String: "icts of people, unless"

Location 3: String: "s those people would r"

Location 4: String: " of the people."

Location 5: String: " of our people."

There were 5 occurrences of the string "people" within the file "Decl of Indep.txt".

Or consider another run looking for the substring oo in the file Decl of Indep.txt.

Looking for the substring "oo" in file "Decl of Indep.txt":

Location 1: String: "public goooood."

Location 2: String: "ublic goooood."

Location 3: String: "blic goooood."

Location 4: String: "lic goooood."

Location 5: String: "armed troops among"

Location 6: String: ". They too have"

Location 7: String: "of the good People"

Location 8: String: "illiam Hooper"

Location 9: String: "s Lightfoot Lee"

Location 10: String: "Witherspoon"

There were 10 occurrences of the string "oo" within the file "Decl of Indep.txt".

Programming Notes: There are several points to be made about this problem in general, and about both of the example runs.

1) Do not use fscanf() to read the data from the input file. As you know, fscanf() tokenizes around white space and would therefore extract each word from the input file separately. Of course, this has both advantages and disadvantages. It would, for example, be a good function to use if we wanted to process only within individual words. But since our program should be able to detect substrings consisting of more than one word, fscanf() will not serve our purposes. Therefore, use fgets() as your primary input function. As we discussed in class, this will read a single line of input from the file at a time and place it in the target buffer.

2) Note that fgets() will put any newline character read from the input file into the target buffer. Note that since were talking about an input file, virtually every read line will have a newline character. This can cause problems if the substring is located at the end of a line since that newline will appear on the screen when the substring and its surrounding text are printed.

a) Suggested solution: after you read a line of input, locate the position of the newline and overwrite it with a \0. The strchr() function would be very useful for this.

3) Consider the first sample run (i.e., looking for the word people). Note that in locations 4 and 5, the word people appears not only at the end of a sentence but also at the end of a line of input. It is, therefore, impossible to display 8 characters after the found substring in those cases, since we are processing on a line-by-line basis. This is perfectly okay. If you follow the suggestion given in 2(a) above, this will not be a problem.

4) Consider the second sample run (i.e., looking for the substring oo). One instance of good in the input file has been deliberately modified to be goooood. It contains, therefore, 4 instances of oo instead of 1. Your program should be able to detect this.

5) There is more than one way to locate substrings within a larger string. One function that can do this is strncmp(), which compares n characters of one string with another. Another function is strstr(), which locates the position of one substring within another and returns a pointer to the found substring.

BELOW IS THE DECLARATION OF INDEPENDENCE TEXT TITLED "Dec of Indep.txt"

The Declaration of Independence of The United States of America

by Thomas Jefferson

Edition 1, (October 12, 2005)

THE DECLARATION OF INDEPENDENCE OF THE UNITED STATES OF AMERICA

IN CONGRESS, July 4, 1776

The unanimous Declaration of the thirteen united States of America

When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume, among the Powers of the earth, the separate and equal station to which the Laws of Nature and of Natures God entitle them, a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation.

We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty, and the pursuit of Happiness.That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed,That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness. Prudence, indeed, will dictate that Governments long established should not be changed for light and transient causes; and accordingly all experience hath shown, that mankind are more disposed to suffer, while evils are sufferable, than to right themselves by abolishing the forms to which they are accustomed. But when a long train of abuses and usurpations, pursuing invariably the same Object evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security.Such has been the patient sufferance of these Colonies; and such is now the necessity which constrains them to alter their former Systems of Government. The history of the present King of Great Britain is a history of repeated injuries and usurpations, all having in direct object the establishment of an absolute Tyranny over these States. To prove this, let Facts be submitted to a candid world.

He has refused his Assent to Laws, the most wholesome and necessary for the public goooood. He has forbidden his Governors to pass Laws of immediate and pressing importance, unless suspended in their operation till his Assent should be obtained; and when so suspended, he has utterly neglected to attend to them. He has refused to pass other Laws for the accommodation of large districts of people, unless those people would relinquish the right of Representation in the Legislature, a right inestimable to them and formidable to tyrants only. He has called together legislative bodies at places unusual, uncomfortable, and distant from the depository of their Public Records, for the sole purpose of fatiguing them into compliance with his measures. He has dissolved Representative Houses repeatedly, for opposing with manly firmness his invasions on the rights of the people. He has refused for a long time, after such dissolutions, to cause others to be elected; whereby the Legislative Powers, incapable of Annihilation, have returned to the People at large for their exercise; the State remaining in the mean time exposed to all the dangers of invasion from without, and convulsions within. He has endeavoured to prevent the population of these States; for that purpose obstructing the Laws of Naturalization of Foreigners; refusing to pass others to encourage their migration hither, and raising the conditions of new Appropriations of Lands. He has obstructed the Administration of Justice, by refusing his Assent to Laws for establishing Judiciary Powers. He has made judges dependent on his Will alone, for the tenure of their offices, and the amount and payment of their salaries. He has erected a multitude of New Offices, and sent hither swarms of Officers to harass our People, and eat out their substance. He has kept among us, in times of peace, Standing Armies without the Consent of our legislatures. He has affected to render the Military independent of and superior to the Civil Power. He has combined with others to subject us to a jurisdiction foreign to our constitution, and unacknowledged by our laws; giving his Assent to their Acts of pretended legislation: For quartering large bodies of armed troops among us: For protecting them, by a mock Trial, from Punishment for any Murders which they should commit on the Inhabitants of these States: For cutting off our Trade with all parts of the world: For imposing taxes on us without our Consent: For depriving us, in many cases, of the benefits of Trial by Jury: For transporting us beyond Seas to be tried for pretended offences: For abolishing the free System of English Laws in a neighbouring Province, establishing therein an Arbitrary government, and enlarging its Boundaries so as to render it at once an example and fit instrument for introducing the same absolute rule into these Colonies: For taking away our Charters, abolishing our most valuable Laws, and altering fundamentally the Forms of our Governments: For suspending our own Legislatures, and declaring themselves invested with Power to legislate for us in all cases whatsoever. He has abdicated Government here, by declaring us out of his Protection and waging War against us. He has plundered our seas, ravaged our Coasts, burnt our towns, and destroyed the lives of our people. He is at this time transporting large armies of foreign mercenaries to compleat the works of death, desolation and tyranny, already begun with circumstances of Cruelty & perfidy scarcely paralleled in the most barbarous ages, and totally unworthy of the Head of a civilized nation. He has constrained our fellow Citizens taken Captive on the high Seas to bear Arms against their Country, to become the executioners of their friends and Brethren, or to fall themselves by their Hands. He has excited domestic insurrections amongst us, and has endeavoured to bring on the inhabitants of our frontiers, the merciless Indian Savages, whose known rule of warfare, is an undistinguished destruction of all ages, sexes and conditions.

In every stage of these Oppressions We have Petitioned for Redress in the most humble terms: Our repeated Petitions have been answered only by repeated injury. A Prince, whose character is thus marked by every act which may define a Tyrant, is unfit to be the ruler of a free People.

Nor have We been wanting in attention to our Brittish brethren. We have warned them from time to time of attempts by their legislature to extend an unwarrantable jurisdiction over us. We have reminded them of the circumstances of our emigration and settlement here. We have appealed to their native justice and magnanimity, and we have conjured them by the ties of our common kindred to disavow these usurpations, which would inevitably interrupt our connections and correspondence. They too have been deaf to the voice of justice and of consanguinity. We must, therefore, acquiesce in the necessity, which denounces our Separation, and hold them, as we hold the rest of mankind, Enemies in War, in Peace Friends.

We, therefore, the Representatives of the United States of America, in General Congress, Assembled, appealing to the Supreme Judge of the world for the rectitude of our intentions, do, in the Name, and by the Authority of the good People of these Colonies, solemnly publish and declare, That these United Colonies are, and of Right ought to be Free and Independent States; that they are Absolved from all Allegiance to the British Crown, and that all political connection between them and the State of Great Britain, is and ought to be totally dissolved; and that as Free and Independent States, they have full Power to levy War, conclude Peace, contract Alliances, establish Commerce, and to do all other Acts and Things which Independent States may of right do. And for the support of this Declaration, with a firm reliance on the Protection of Divine Providence, we mutually pledge to each other our Lives, our Fortunes and our sacred Honor.

Button Gwinnett Lyman Hall George Walton

William Hooper Joseph Hewes John Penn

Edward Rutledge Thomas Heyward, Jr. Thomas Lunch, Jr. Arthur Middleton

John Hancock

Samuel Chase William Paca Thomas Stone Charles Carroll of Carrollton

George Wythe Richard Henry Lee Thomas Jefferson Benjamin Harrison Thomas Nelson, Jr. Francis Lightfoot Lee Carter Braxton

Robert Morris Benjamin Rush Benjamin Franklin John Morton George Clymer James Smith George Taylor James Wilson George Ross

Caesar Rodney George Read Thomas McKean

William Floyd Philip Livingston Francis Lewis Lewis Morris

Richard Stockton John Witherspoon Francis Hopkinson John Hart Abraham Clark

Josiah Bartlett William Whipple

Samuel Adams John Adams Robert Treat Paine Elbridge Gerry

Stephen Hopkins William Ellery

Roger Sherman Samuel Huntington William Williams Oliver Wolcott

Matthew Thornton