sSTRINGS

reading a line as a String

The function char *gets(char *str) reads a line from STDIN and stores it into the string pointed to by str. It stops when either the newline character is read or when the end-of-file is reached, whichever comes first.

char sentence[100]; printf("Enter a sentence: "); gets(sentence);

Note: You should NEVER use gets function in production code because it has a buffer overflow vulnerability.

A safer alternative is the char *fgets(char * str, int num, FILE * stream) function which reads characters from stream and stores them into str until (num-1) characters have been read or either a newline or the end-of-file is reached, whichever happens first.

printf("Enter sentence: ");

char sentence[10];

fgets(sentence, sizeof(sentence), stdin);

sentence[strlen(sentence) - 1 ] = '\0'; // To remove the ' ' character from the end.

One undesirable side effect of fgets it stores the new line character ' ' if it reads one in the input. This means that you will have to manually overwrite the position of the newline character say with '\0' .

String.h Library

Length of a String

The function size_t strlen(const char *str) returns the number characters in a string not counting the terminating null.

Concatenate Strings

The function char * strcat ( char * destination, const char * source ) appends the source string to the end of the destination string.

char str1[30] = "Jan 12,";

char str2[] = " 1842";

strcat (str1, str2);

printf("%s ", str1);

The output of this code will be :

Jan 12, 1842

String Tokens

The function char * strtok ( char * source, const char * delimiters) breaks the parameter source into tokens by finding group of characters separated by any of the delimiting characters .

#include

#include

#define COMMA ",."

int main(int argc, char const *argv[]) {

char date[] = "Jan 12, 1842. May 13, 2018";

char *token = strtok(date, COMMA);

while(token != NULL) {

printf("%s ", token);

token = strtok(NULL, COMMA);

}

}

The output of this code will be :

Jan 12

1842

May 13

2018

NOW THE TASK IS TO:

Write a simple program in C that asks the user for:

Street Address (Max 100 characters)

Address Line 2 (Maximum 100 characters)

City (Maximum 100 characters)

State (Maximum 100 characters)

Zip Code: Maximum 15 characters.

Your program should then a concatenate all the address fields together into one string and print out that string. Use strcat in this task.dont use malloc,struct or alloc.use strings msotly

thanks!