119. Convert Hexadecimal String to Integer Without strtol or sscanf functions

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Code

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

uint16_t hex_to_uint(const char *str) {
    int value = 0;
    for(int i = 0; str[i]; i++) {
        char c = str[i];
        int digit = (c >= 'A') ? (c >= 'a') ? ((c-32) - 'A' + 10):(c - 'A' + 10) : (c - '0');
        value = (value << 4) | digit;
    }
    return value;
}

int main() {
    char hex[10];
    scanf("%s", hex);

    printf("%u", hex_to_uint(hex));
    return 0;
}

Solving Approach

 

 

 

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