Convert Character to Integer (C Language)

char2int.c

#include <stdio.h>
 
int main(){
        char c[5] = "23452";
        char d[5] = "23452";
        int result=0, factor=3;
        int numeric;
 
        // take and convert 1 character from an array
        numeric = c[2] - '0'; // --> 4
        result = factor*numeric; // result=12
        printf("Result : %d\n", result);
 
        // convert array of char to int
        numeric = atoi(d); // --> 23452
        result = factor*numeric; // result = 70356
        printf("Result : %d\n", result);
}