In the C program below, I have it to check a text file to check if it is a palindrome. However, my program will not ignore spaces and non-alpha characeters in the file. for example " never odd or even!" is a palindrome, but this program considers the spaces and the ! as characters. Can you help fix this program?

#include #include

void modtext(char line[]); int isPalindrome(char line[]);

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

if(argc!=2) { //Error if not filename is entered ****************** printf("Please enter filename after %s ", argv[0]); return -1; } //To open my file ******************************** FILE *fp; fp = fopen(argv[1], "r");

if(fp==NULL){ printf("Unable to open file "); return -1; } //To create the two output files that my program writes to****** FILE *fPal = fopen("palindromeOut.txt", "w"); FILE *fQuote = fopen("quotesOut.txt", "w");

char line[1000];

while(!feof(fp)) { fscanf(fp, " %[^ ]s", line); modtext(line); int isPal = isPalindrome(line); line[0] = toupper(line[0]);

if(isPal){ //To print to palindromeOut.txt *************** fprintf(fPal, "%s ", line); //To print to screen ************************** printf("Palindrome:%s ", line ); }else{ //To print to quoteOut.txt ******************* fprintf(fQuote, "%s ", line); //To print to screen ************************ printf("Quote:%s ", line ); line[0] = '\0'; } }

//To close my files *************************** fclose(fp); fclose(fPal); fclose(fQuote);

return 0;

}

void modtext(char line[]){

int i=0;

while(line[i]!='\0'){ if(line[i]>='A' && line[i]<='Z') line[i] = line[i]+32; i++; }

}

int isPalindrome(char line[]){ int i, j, k, len=0; k = i; while(line[len]!='\0') len++; for(i=0; i <= len; i++){ if(line[i]!=line[len-i-1]) return 0;

}

return 1;

}