String to Long Conversion

1#include <stdio.h>
2#include <stdlib.h>
3
4int main() {
5    char str1[] = "12345";
6    char str2[] = "   -9876";
7    char str3[] = "123abc456";
8    char *endptr;
9    
10    long num1 = strtol(str1, &endptr, 10);
11    printf("\"%s\" -> %ld\n", str1, num1);
12    
13    long num2 = strtol(str2, &endptr, 10);
14    printf("\"%s\" -> %ld\n", str2, num2);
15    
16    long num3 = strtol(str3, &endptr, 10);
17    printf("\"%s\" -> %ld (stopped at: \"%s\")\n", str3, num3, endptr);
18    
19    // atol() is simpler but less safe
20    printf("\nUsing atol(): %ld\n", atol(str1));
21    
22    return 0;
23}