why won't this run?

This is a discussion on why won't this run? within the C Programming forums, part of the General Programming Boards category; I don't have any errors but when it runs it tells me the program is an illegal operation. #include <stdio.h> ...

  1. #1
    Registered User
    Join Date
    Oct 2001
    Posts
    5

    Question why won't this run?

    I don't have any errors but when it runs it tells me the program is an illegal operation.

    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>

    void insert(char *str, char *substr, int i){

    char buffer[255];
    int x;

    /* copy everything from index to end of str into buffer */
    for(x=0;x<strlen(str)-i; x++){
    buffer[x] = str[x+i];
    }

    /* cut off everything from index to end of str */
    str[i] ='\0';

    /* hook together str + substr + buffer */
    strcat(str,substr);
    strcat(str,buffer);
    }

    int main(int argc, char *argv[])
    {
    char str[255]= "helloworld";
    char substr[25]= "wide";
    int i = 5;


    insert(str,substr,i);
    printf(str);
    return 0;
    }

  2. #2
    Registered User
    Join Date
    Oct 2001
    Posts
    36
    >for(x=0;x<strlen(str)-i; x++){
    for(x=0;x<=strlen(str)-i;x++){
    //str[strlen(str)]=='\0'

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