This C code compiles successful, however when I execute, it asks for the number, but in the end it doesnt show the final result, instead it shows an empty line:

#include <stdlib.h>
#include <string.h>
#include <math.h>

int main()
{ 
    int number, u, t, h, sum;
    char parity[7] = "";
    float result;

    printf("Number : ");
    scanf("%u", &number);

    u = (int)number % 10;
    t = (int)number % 100 / 10;
    h = (int)number / 100;
    sum =  u   t   h;

    if (number >= 100 && number <= 999)
    {
        if (number % 2 == 0)
        {
            strcpy(parity[7], "even");
            result = pow(sum, 2);
            printf("%u   %u   %u = %u : %s ---> %u*%u = %.0f \n", u, t, h, sum, parity[7], sum, sum, result);
        }
        else if (number % 2 == 1)
        {
            strcpy(parity[7], "odd");
            result = sqrt(sum);
            printf("%u   %u   %u = %u : %s ---> Sqrt(%u) = %.2f \n", u, t, h, sum, parity[7], sum, result);
        }
    }
    return 0;
}

CodePudding user response：

Try this one

#include <string.h>
#include <math.h>
#include <stdio.h>

int main()
{ 
    int number, u, t, h, sum;
    char parity[7];
    float result;

    printf("Number : ");
    scanf("%u", &number);

    u = (int)number % 10;
    t = (int)number % 100 / 10;
    h = (int)number / 100;
    sum =  u   t   h;

    if (number >= 100 && number <= 999)
    {
        if (number % 2 == 0)
        {
            strcpy(parity, "even");
            result = pow(sum, 2);
            printf("%d   %d   %d = %d : %s ---> %u*%u = %.0f \n", u, t, h, sum, parity, sum, sum, result);
        }
        else if (number % 2 == 1)
        {
            strcpy(parity, "odd");
            result = sqrt(sum);
            printf("%d   %d   %d = %d : %s ---> Sqrt(%u) = %.2f \n", u, t, h, sum, parity, sum, result);
        }
    }
    return 0;
}

CodePudding user response：

here is the results of your posted code.

This cannot be considered a successful compile. regardless of what the compiler says

gcc -ggdb3 -Wall -Wextra -Wconversion -pedantic -std=gnu11 -c "untitled.c" -o "untitled.o" 
untitled.c: In function ‘main’:
untitled.c:11:5: warning: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]
   11 |     printf("Number : ");
      |     ^~~~~~
untitled.c:11:5: warning: incompatible implicit declaration of built-in function ‘printf’
untitled.c:4:1: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’
    3 | #include <math.h>
      | #include <stdio.h>
    4 |
untitled.c:12:5: warning: implicit declaration of function ‘scanf’ [-Wimplicit-function-declaration]
   12 |     scanf("%u", &number);
      |     ^~~~~
untitled.c:12:5: warning: incompatible implicit declaration of built-in function ‘scanf’
untitled.c:12:5: note: include ‘<stdio.h>’ or provide a declaration of ‘scanf’
untitled.c:12:13: warning: format ‘%u’ expects argument of type ‘unsigned int *’, but argument 2 has type ‘int *’ [-Wformat=]
   12 |     scanf("%u", &number);
      |            ~^   ~~~~~~~
      |             |   |
      |             |   int *
      |             unsigned int *
      |            %u
untitled.c:23:26: warning: passing argument 1 of ‘strcpy’ makes pointer from integer without a cast [-Wint-conversion]
   23 |             strcpy(parity[7], "even");
      |                    ~~~~~~^~~
      |                          |
      |                          char
In file included from untitled.c:2:
/usr/include/string.h:122:14: note: expected ‘char * restrict’ but argument is of type ‘char’
  122 | extern char *strcpy (char *__restrict __dest, const char *__restrict __src)
      |              ^~~~~~
untitled.c:24:22: warning: conversion from ‘double’ to ‘float’ may change value [-Wfloat-conversion]
   24 |             result = pow(sum, 2);
      |                      ^~~
untitled.c:25:42: warning: format ‘%s’ expects argument of type ‘char *’, but argument 6 has type ‘int’ [-Wformat=]
   25 |             printf("%u   %u   %u = %u : %s ---> %u*%u = %.0f \n", u, t, h, sum, parity[7], sum, sum, result);
      |                                         ~^                                      ~~~~~~~~~
      |                                          |                                            |
      |                                          char *                                       int
      |                                         %d
untitled.c:29:26: warning: passing argument 1 of ‘strcpy’ makes pointer from integer without a cast [-Wint-conversion]
   29 |             strcpy(parity[7], "odd");
      |                    ~~~~~~^~~
      |                          |
      |                          char
In file included from untitled.c:2:
/usr/include/string.h:122:14: note: expected ‘char * restrict’ but argument is of type ‘char’
  122 | extern char *strcpy (char *__restrict __dest, const char *__restrict __src)
      |              ^~~~~~
untitled.c:30:22: warning: conversion from ‘double’ to ‘float’ may change value [-Wfloat-conversion]
   30 |             result = sqrt(sum);
      |                      ^~~~
untitled.c:31:42: warning: format ‘%s’ expects argument of type ‘char *’, but argument 6 has type ‘int’ [-Wformat=]
   31 |             printf("%u   %u   %u = %u : %s ---> Sqrt(%u) = %.2f \n", u, t, h, sum, parity[7], sum, result);
      |                                         ~^                                         ~~~~~~~~~
      |                                          |                                               |
      |                                          char *                                          int
      |                                         %d
Compilation finished successfully.