Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    int num=0;
    int i=0;
    int sign=1;
    if(str[i] == '-'){
        sign=-1;
        i++;
    }
    else if(str[i]=='+'){
        sign=1;
        i++;
    }
    while(str[i] >= '0' && str[i] <='9'){
        num=num*10 + (str[i]-'0');
        i++;
    }
    return sign*num;
}

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