levkur

I'm fairly new at programming and need some help whit this program. The DO-while loop only prompts to Run Again only once and just quites after running.

code:

#include<stdin.h>
main()
{
int x,y,z;
char ans;
do
{ ...
printf("Run Again?(y,n)");
scanf("%c",&ans);
}
while(ans==89 || ans==121);
}

Please help

Daniel_kd

the problem is that scanf("%c",ans); reads only one character the '\n'(new line character) that is inserted by the enter button is read burring the second run and gets out of the loop as the while condition is 0.

to solve this add getchar() at the end of the loop.
so the code will be looking like this

Actually if the user enters a lot of charactrs this will take only the first one. If you want to "clean" more chars you have to declare an array of chars and use gets(char *) like this:

finally the same effect will have the command "fflush(stdin);" after the fscan in the loop. This cleans everything that has been typed by the user and hasn't yet been "read" by the program

Ooble

I suggest using the fflush(stdin); statement instead of getchar - getchar might screw up on a different system.

__________________
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levkur

thanks alot daniel and ooble. I was looking for the fflush function but i could remeber it until i saw it here. anyway, the fflush fuction didnt work for some reason, it said stdin was undefined. I don;t know whats going on. The getchar function worked so thanks alot for all you help.

Monster

Just a small note:

1. Do not use the fflush function on input buffers, this is undefined behaviour.

2. Never use the gets function, use the fgets function instead.

To flush the input buffer, you can use the getchar function in a while loop:

nadiralishah

Try This........this will work

#include<stdio.h>
#include<conio.h>
main()
{
int x,y,z;
char ans;
do
{ ...
printf("Run Again?(y,n)");
ch = getche();
}
while(ch != 'n' || ch!= 'N");
}