Convert String to Integer

Code

#include <stdio.h>
#include <stdint.h>

int custom_atoi(const char *str) {
    // Your logic here
    int i =0;
    int negative = 0;
    int ans = 0;
    if (str[i] != '\0'){
        if (str[i] == '-'){
            negative = 1;
            i++;
        } else if (str[i] == '+'){
            negative = 0;
            i++;
        }
    }

    while(str[i] != '\0'){
        if (str[i] >= '0' && str[i] <= '9'){
            ans = (ans*10) + (str[i] - '0');
        } else {
            break;
        }
        i++;
    }

    if (negative){
        ans *= -1;
    }
    return ans;
}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    uint8_t i = 0;
    while (str[i]) {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    printf("%d", custom_atoi(str));
    return 0;
}

Solving Approach