98. Convert String to Integer

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Code

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

int custom_atoi(const char *str) {
    // Your logic here
    int s=1;
    int i=0;
    if(str[0]=='-'){
        s=-1;
        i++;
    }else if(str[0]=='+'){
        i++;
    }
    int ans=0;
    
    while(str[i]>='0' && str[i]<='9'){
        ans=ans*10+(str[i]-'0');
        i++;
    }
            
    return ans*s;
}

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

 

 

 

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