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Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    int num_flag = 0;
    int alp_flag = 0;

    while (*str) {
        if ((*str >= 'A' && *str <= 'Z') || (*str >= 'a' && *str <= 'z')) {
            alp_flag = 1;
        } else if (*str >= '0' && *str <= '9') {
            num_flag = 1;
        } else {
           
            num_flag = 1;
            alp_flag = 1;
        }
        str++;
    }

    if (num_flag && alp_flag) {
        printf("MIXED\n");
    } else if (num_flag) {
        printf("NUMERIC\n");
    } else if (alp_flag) {
        printf("ALPHABETIC\n");
    } else {
        printf("EMPTY\n");
    }
}

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++;
    }

    classify_string(str);
    return 0;
}

Solving Approach

 

 

 

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Input

123456

Expected Output

NUMERIC