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ATOI - convert ASCII string to integer
#include <stdlib.h>
#include <stdio.h>

int main() {
    char c[] = "1";
    int num = atoi(c);
    num++;
    printf("Num = %d", num);
}
 
#include <stdio.h>
#include <stdlib.h>

int main() {
    char c[10];
    c[0] ='7';
    c[1] ='5';
    c[2] ='\0';
    int num = atoi(c);
    printf("Num = %d\n", num);
    num++;
    printf("Num = %d\n", num);
}
เพิ่มเติม: visualcplus.blogspot.com