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 value =0;
    bool negative = false;
    if ( *str == '+')
            { str++; }

    else if ( *str == '-')
            { str++; negative = true;}
            
    while ( *str !='\0'){

     if ( *str >= '0' && *str <= '9'){
                value = value *10 + (*str - '0');
            }
            else break;
            str++;
    } 
    if ( negative ){
        value =- value;
    }
    return value;
}

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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