conditional_statement_in_C.c

#include <assert.h>
#include <limits.h>
#include <math.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char* readline();



int main()
{
    char* n_endptr;
    char* n_str = readline();
    int n = strtol(n_str, &n_endptr, 10);

    if ( n>=1 && n<=9) 
     {
       switch(n)
    {
        case 1:
       printf("one");
       break;
    case 2:
       printf("two");
       break;
    case 3:
       printf("three");
       break;
    case 4:
       printf("four");
       break;
    case 5:
       printf("five");
       break;
    case 6:
       printf("six");
       break;
    case 7:
       printf("seven");
       break;
    case 8:
       printf("eight");
       break;
    case 9:
      printf("nine");
      break;
  
    }
   }
   else 
   printf("Greater than 9");

    return 0;
}

char* readline() {
    size_t alloc_length = 1024;
    size_t data_length = 0;
    char* data = malloc(alloc_length);

    while (true) {
        char* cursor = data + data_length;
        char* line = fgets(cursor, alloc_length - data_length, stdin);

        if (!line) { break; }

        data_length += strlen(cursor);

        if (data_length < alloc_length - 1 || data[data_length - 1] == '\n') { break; }

        size_t new_length = alloc_length << 1;
        data = realloc(data, new_length);

        if (!data) { break; }

        alloc_length = new_length;
    }

    if (data[data_length - 1] == '\n') {
        data[data_length - 1] = '\0';
    }

    data = realloc(data, data_length);

    return data;
}