write error message to a file

#include <stdio.h>
#include <string.h>
int main()
{
    int i;
    FILE *fp;
    
    fp = fopen("strerror.txt", "w");
    for (i = 0; i < 43; i++) {
        fprintf(fp, "strerror[%d] = /"%s/";/n", i, strerror(i));
    }
    close(fp);
    getchar();
    return 0;
}