atoi()

turns an ascii representation of a number into an integer. for example: "992310" → 992310

#include <stdio.h>
 
int atoi(char s[]){
    int i,n;
    n=0;
    for (i=0; s[i] >= '0' && s[i] <= '9'; i++){
        n = 10 * n + s[i] - '0';
    }
    return (n);
}
 
 
int main(){
    char strig[] = {'9','2','0','6','5','1','\0'};
    printf("%d", atoi(strig));
    return 0;
}