Question

How to replace the first N characters in a string in C

Answer 1

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

int main(void) {
    char s[64] = "pro c programming";
    char dest[64] = "";

    int N = 3;
    strcpy(s, (strcat(strcpy(dest, "XYZ"), s + N)));

    puts(s);

    return 0;
}




/*
run:

XYZ c programming

*/

 

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Answer 2

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

int main(void) {
    char s[64] = "pro c programming";
    char replace[4] = "XYZ";

    int N = 3;
    for (int i = 0; i < N; i++)
        s[i] = replace[i];

    puts(s);

    return 0;
}




/*
run:

XYZ c programming

*/

 

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