C compiling problem

I am new here and started learning C from a tutorial. The tutorial comes with sample codes to learn from but when a compile the following (using gcc on ubuntu) I get an error which I will put after the code. I have tried using gcc, cc, and g++ commands to compile it as I dont really know which is best. Can anyone let me know what is wrong or if there is something wrong with the code. Thanks a lot.

CODE:

Code:

       /* Chapter 5 - Program 1 - SUMSQRES.C */
#include <stdio.h>

int sum; /* This is a global variable */

int main()
{
int index;

   header();          /* This calls the function named header */
   for (index = 1 ; index <= 7 ; index++)
      square(index);  /* This calls the square function */
   ending();          /* This calls the ending function */

   return 0;
}


header()        /* This is the function named header */
{
   sum = 0;     /* Initialize the variable "sum" */
   printf("This is the header for the square program\n\n");
}


square(number)   /* This is the square function */
int number;
{
int numsq;

   numsq = number * number;  /* This produces the square */
   sum += numsq;
   printf("The square of %d is %d\n", number, numsq);
}


ending()   /* This is the ending function */
{
   printf("\nThe sum of the squares is %d\n", sum);
}

/* Result of execution

This is the header for the square program

The square of 1 is 1
The square of 2 is 4
The square of 3 is 9
The square of 4 is 16
The square of 5 is 25
The square of 6 is 36
The square of 7 is 49

The sum of the squares is 140

*/

ERROR:
tyler@ubuntu:~/Desktop/c$ g++ -o SUMSQRES SUMSQRES.C
SUMSQRES.C: In function ‘int main()’:
SUMSQRES.C:10: error: ‘header’ was not declared in this scope
SUMSQRES.C:12: error: ‘square’ was not declared in this scope
SUMSQRES.C:13: error: ‘ending’ was not declared in this scope
SUMSQRES.C: At global scope:
SUMSQRES.C:19: error: ISO C++ forbids declaration of ‘header’ with no type
SUMSQRES.C:26: error: expected constructor, destructor, or type conversion before ‘(’ token
SUMSQRES.C:28: error: expected unqualified-id before ‘{’ token
SUMSQRES.C:37: error: ISO C++ forbids declaration of ‘ending’ with no type\

Note: the †things are supposed to be ()

 

Please read the "Before you make a query" thread and correct your post.

 

Tyler3777

Did you ever get an answer to this post??? If not look for a file canswers.htm

BesRegs

 

At first - I an non english speaker, so I might make some mistakes. And secondly - this program should be working now fine:

Code:

       /* Chapter 5 - Program 1 - SUMSQRES.C */
#include <stdio.h>

int sum; /* This is a global variable */

void header (void);  // You should write function headers if you use it before defining
void square (int);    // I guess you programmed in Pascal before
void ending (void); // Here, in C, you must always define the return type of a function

int main()
{
int index;

   header();          /* This calls the function named header */
   for (index = 1 ; index <= 7 ; index++)
      square(index);  /* This calls the square function */
   ending();          /* This calls the ending function */

   return 0;
}


void header()        /* This is the function named header */
{
   sum = 0;     /* Initialize the variable "sum" */
   printf("This is the header for the square program\n\n");
}


void square(int number)   /* This is the square function */
//int number;    This line was not correct I think.
{
int numsq;

   numsq = number * number;  /* This produces the square */
   sum += numsq;
   printf("The square of %d is %d\n", number, numsq);
}


void ending()   /* This is the ending function */
{
   printf("\nThe sum of the squares is %d\n", sum);
}