Convert String to Integer

Code

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

int custom_atoi(const char *str) {
    
    signed int num = 0;
    char sign;

    // Your logic here

    while(*str !='\0'){

        if(*str == '+' || *str == '-'){

            sign = *str;
            str++;
            continue;

        } 

        if(*str >= '0' && *str <= '9'){
        
            num = num * 10 + (*str - '0');

        } else break;

        str++;

    }

    if(sign == '-'){

        num = 0 - num;
    }

    return 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