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

int main()
{
    char temp[7];
    int i;

    memset(temp, 0, sizeof(temp));

    temp[0] = '4';
    temp[1] = '2';

    i = atoi(temp);

    printf("Foo: %s\n", temp);
    printf("Bar: %d\n", i);

    return 0;
}

Foo: 42
Bar: 42