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Hello today i just started my optional C programming language in CS because many have told me that is good to start with C. I have a homework to do a small program with 2 digits and to check if one of them or their sum is 10 to print me " one number or their sum is 10 " or else print " none of them or their sum is 10 ". I wrote this in codeblocks

#include <stdio.h> 
#include <string>
int sum , n1 , n2; 
scanf("%d %d" , &n1 , &n2);
if((n1==10) || (n2==10))
printf("A number or their sum is 10");
sum=n1+n2;
if(sum==10)
printf("A number or their sum is 10")
{
    else if 
    printf("Numbers or their sum is not 10");
}
return 0;
}


i get some errors :

Syntax Error(s)
__tester__.cpp:4:6: error: expected constructor, destructor, or type conversion before '(' token
 scanf("%d %d" , &n1 , &n2);
      ^
__tester__.cpp:5:1: error: expected unqualified-id before 'if'
 if((n1==10) || (n2==10))
 ^~
__tester__.cpp:7:1: error: 'sum' does not name a type
 sum=n1+n2;
 ^~~
__tester__.cpp:8:1: error: expected unqualified-id before 'if'
 if(sum==10)
 ^~
__tester__.cpp:14:1: error: expected unqualified-id before 'return'
 return 0;
 ^~~~~~
__tester__.cpp:15:1: error: expected declaration before '}' token
 }
 ^


What I have tried:

i searched them on google but dont found something really helpfull. Sorry if i m bad i m new to C
Posted
Updated 14-Nov-22 4:25am
Comments
Pascal Vlad 14-Nov-22 8:27am    
__tester__.cpp: In function 'int main()':
__tester__.cpp:10:1: error: expected ';' before '{' token
{
^

You must have a main function, see example here:
How to create and run C program using CodeBlocks - Codeforwin[^]

Note that the following is C specific code and won't work in C++:
#include <stdio.h> 
#include <string.h>

For C++ see:
How to Download Code Blocks and Write a Hello World Program in C++ : 50 Steps - Instructables[^]
 
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v4
Comments
Pascal Vlad 14-Nov-22 8:27am    
__tester__.cpp: In function 'int main()':
__tester__.cpp:10:1: error: expected ';' before '{' token
{
^
RickZeeland 14-Nov-22 8:34am    
and what happens when you try the hello world example?
C console programs always start in the main function, so a minimal C app would look like this:
C
#include <stdio.h>

int main()
    {
    printf("Hello World\n");
    return 0;
    }
All executable code except global variable definitions (with or without simple assignments) must be inside a function.
So your line:
C
int sum , n1 , n2; 
could be outside any function (but in this case is probably not a good idea as they dont; need to be global variables) but no other lines can be.
It's also a very good idea to indent your code - it makes it a lot more obvious what you expect to happen, and to match up brackets.
In addition, it's a good idea to always use curly brackets in if, else, and loops - particularly when you are just getting started.

So try like this:
C
#include <stdio.h> 
int main()
    {
    int sum , n1 , n2; 
    scanf("%d %d" , &n1 , &n2);
    if ((n1 == 10) || (n2 == 10))
        {
        printf("A number or their sum is 10");
        }
    else
        {
        sum = n1 + n2;
        if (sum == 10)
            {
            printf("A number or their sum is 10")
            }
        else 
            {
            printf("Numbers or their sum is not 10");
            }  
        }
    return 0;
    }
 
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Quote:
__tester__.cpp:4:6: error: expected constructor, destructor, or type conversion before '(' token

Why .cpp? You are supposed to write a C (.c) program.
Try
C
#include <stdio.h>
  
int main()
{
  int n1 , n2;

  scanf("%d %d" , &n1 , &n2);

  if( (n1 == 10) || (n2 == 10) || ((n1+n2) == 10))
    printf("One number or their sum is 10\n");
  else
    printf("None of them or their sum is 10\n");

  return 0;
}
 
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