a strange problem, hard to solve too

hi everyone,
i'm a new computer engineer and C is among the beginning courses.
anyway i put the first program source code in my software which is "dev c++ version 4.9.9.2" under windows pro 5.1
the source is:

Code:

---

#include<stdio.h>
main()
{
      printf(" hello world");
      return(0);
}

---

the problem is that when i run this program
it opens and closes quickly like a flash so i couldn't look at what is written in it.
please help me as soon as possible. thanks a lot

The FAQ answers your questions:

FAQ > How do I... (Level 1) > Stop my Windows Console from disappearing everytime I run my program?

FAQ > How do I... (Level 1) > How do I get my program to wait for a keypress?

Sure is a tough one to solve.

dude... the program already ran, run it in DOS and you will see, or put something like

Code:

---

#include <stdio.h>
#include <stdlib.h>

int main()
{
    printf("hello world\n");
    system("pause");
    return (0);
}

---

try that and you will be able to see the words :)

"hard to solve" sure got my attention.

i had the exact same problem when i first looked into c.

yes... and me also!!! i remember that problem!!! ...a simple scanf() sorts it out! ...either that or just run it on linux and output is on the shell!!! far easier!

thanks a lot friends but how can we do that if we have a program that holds "if" statments wouldn't be harder work or it's going to be a simple stuff

why making it so complicated. just place a standard function getchar before the return statment. It just solves the problem. Look the sample code

Code:

---

#include <stdio.h>

int main()
{
    printf("Hello World\n");
   
    getchar();
    return 0;
}

---

And read the FAQ. About this. And system("PAUSE"); Wouldn't be a good idea cos it has to trap to OS and it not portable. Works only on windows machince and take too much processing time.

ssharish2005

thanks a lot friends and experts i'm very happy to be a part of this science community. anyway
this is a code that i have made

Code:

---

#include<stdio.h>
#include<math.h>
#include<stdlib.h>
main(void)
{
      double a,b,c,d,X1,X2;
      printf(" this program can solve equations of degree two");
      printf("\n this kind of equations has this format ax²+bx+c=0");
      printf("\n so you have to know the entegers a,b,c before the beginning");
      printf("\n please enter the digit a:");
      scanf("%lf",&a);
      printf("\n please enter the digit b:");
      scanf("%lf",&b);
      printf("\n please enter the digit c:");
      scanf("%lf",&c);
      d = (b*b)-(4*a*c);
      printf(" this is delta of the equation: %f",d);

      if (d < 0);
      printf("\nthis equation doesn't have any solution\n");
      system("pause");
      if(d > 0);
      printf("\nthis equation accept a solution\n");
      X1=(-b-(sqrt(d)))/(2*a);
      X2=(-b+(sqrt(d)))/(2*a);
      system("pause");
      printf("The solution is X1=%f and X2=%f",X1,X2);
      system("pause");

---

this is the code please help me editing it. thanks a lot

Code:

---

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

int main()
{
      double a,b,c,d,X1,X2;
     
      printf(" this program can solve equations of degree two");
      printf("\n this kind of equations has this format ax&#178;+bx+c=0");
      printf("\n so you have to know the entegers a,b,c before the beginning");
      printf("\n please enter the digit a:");
      scanf("%lf",&a);
     
      printf("\n please enter the digit b:");
      scanf("%lf",&b);
     
      printf("\n please enter the digit c:");
      scanf("%lf",&c);
      d = (b*b)-(4*a*c);
     
      printf(" this is delta of the equation: %f",d);

      if (d < 0)
      {
            printf("\nthis equation doesn't have any solution\n");
            getchar();
      }
       
      if(d > 0)
      {
            printf("\nthis equation accept a solution\n");
            X1=(-b-(sqrt(d)))/(2.0*a);
            X2=(-b+(sqrt(d)))/(2.0*a);
            printf("The solution is X1=%f and X2=%f",X1,X2);
            getchar();
      }   

      return 0;
}

---

Point out the differeces and post again

ssharish2005

thanks a lot a lot a lot now i can program thank you friends.


NB: you forgot to put the function getchar(); after the first ""printf(" this is delta of the equation: %f",d); "" i mean before the first if

a,b,c are numbers not digits

getchar(); better take out of the if - put just before return

when d ==0 where is just 1 root

"a" should be cheched to be not 0 - other wise you get the crash

thanks a lot

Quote:

---

Originally Posted by ssharish2005

why making it so complicated. just place a standard function getchar before the return statment. It just solves the problem. Look the sample code

Code:

---

#include <stdio.h>

int main()
{
    printf("Hello World\n");
   
    getchar();
    return 0;
}

---

And read the FAQ. About this. And system("PAUSE"); Wouldn't be a good idea cos it has to trap to OS and it not portable. Works only on windows machince and take too much processing time.

ssharish2005

---

dont make suggestions about making the program wait. If you are developing a console program on MSVC for instance you fire up the program and it adds the wait for you. So when adding a manual wait you got 2 waits suddenly. Just fire up the damn program from a console!