Thread: function help please

4. Write a program with two functions both called from main(). The first function just prints "Hello". In the second function ask the user to enter a number. Calculate the square root of the number and return the result to main(). In main() print the square root value.

Code:

Code:

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

float fun3 (float );    
main()
{
    float answer;
    float a;
    answer = fun3(a);    
    puts("\nBack in main");    
    printf("\nThe result is %.2f", answer);    
    getch();
}

float fun3 (float c)    
{
    float x;
    float y;
    printf("\nHello");
    printf("\n\nPlease enter a number: ");  
    scanf("%f",&x);                            
    y = sqrt(x);                         
    return (y);                        
}

Can you help me Please? I made a logic mistake in function.

Not sure what you were thinking with the variable passing to your square root function, but whatever. I changed your fun3's parameters to void, and created an actual function for the Hello thing. Also I fixed your getch function, by using a getc(stdin) instead. If you're trying to do what I think your doing though, it might not work. Compiliers (Like mine) usually just ignore it because they think there is no point in using it. You might want to replace it with a macro and the system functions. Anyways, this is the program I came up with after fixing yours.

Code:

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


float fun3 ( void );
void HelloWorld( void );


int main()
{
    float answer;


    HelloWorld();


    answer = fun3();


    puts("\nBack in main");


    printf("\nThe result is %.2f", answer);


    getc(stdin);


    return 0;
}


float fun3 ( void )
{
    float x;
    float y;


    printf("\nPlease enter a number: ");


    scanf("%f",&x);
    y = sqrt(x);
    return (y);
}


void HelloWorld( void ) {
    puts("\nHello");
    return;
}

Thank You So Much BatchProgrammer! You help me a lot.