do-While not working

This is a discussion on do-While not working within the C Programming forums, part of the General Programming Boards category; Plz see this program here do-while loop not working : Code: #include<stdio.h> #include<conio.h> #include<math.h> void main() { int i,j,k,n,max; float ...

  1. #1
    Registered User
    Join Date
    Jul 2009
    Posts
    1

    do-While not working

    Plz see this program here do-while loop not working :


    Code:
    #include<stdio.h>
    #include<conio.h>
    #include<math.h>
    void main()
    {
    int i,j,k,n,max;
    float factor,sum,a[10][10],t,x[10];
    char ch;
    do
    {
    printf("\n Enter n: ");
    scanf("%d",&n);
    	for(i=0;i<n;i++)
    	{
    	    for(j=0;j<n+1;j++)
    	    {
    		printf("\nEnter %d row %d col element\n",i+1,j+1);
    		scanf("%f",&a[i][j]);
    	    }
    	}
    	printf("The Input is :\n");
    	for(i=0;i<n;i++)  {
    	for(j=0;j<n+1;j++)
    	printf(" %f\t ", a[i][j]);
    	printf("\n");
    	}
    	for(i=0;i<n;i++)
    	{
    	max=i;
    	for(j=i+i;j<n;j++)
    	if(fabs (a[j][i]) > fabs(a[max][i]))
    	max=j;
    	for(j=0;j<n+1;++j)
    	{
    	t=a[max][j];
    	a[max][j]=a[i][j];
    	a[i][j]=t;
    	}
    	}
    
    	printf("\n The Net argument matrix \n");
    	for(i=0;i<n;i++)
    	{
    	for(j=0;j<n+1;j++)
    	printf(" %f \t ",a[i][j]);
    	printf("\n");
    	}
    	for(k=0;k<n;k++)
    	{
    	for(i=k+1;i<n;i++)
    	{
    	factor=a[i][k]/a[k][k];
    	for(j=k;j<n+1;j++)
    	a[i][j]-=factor*a[k][j];
    	}
    	}
    	x[n-1]=a[n-1][n]/a[n-1][n-1];
    	for(i=n-2;i>=0;i--)
    	{
    	sum=0;
    	for(j=i;j<n+1;j++)
    	sum+=a[i][j]*x[j];
    	x[i]=(a[i][n]-sum)/a[i][i];
    	}
    	for(i=0;i<n;i++)
    	printf("\n X%d = %g\n",i+1,x[i]);
            } while (ch=='y' || ch=='Y');
    	getch();
    	}

  2. #2
    Registered User
    Join Date
    Mar 2007
    Posts
    416
    1) Whats the question?
    2) What are the errors?
    3) Indent properly (you know how hard that is to read?)
    4) What is it suppose to do?

    Formatting your code is also a factor in how well you write code.

  3. #3
    ZuK
    ZuK is offline
    Registered User
    Join Date
    Aug 2005
    Location
    Austria
    Posts
    1,990
    You never assign anything to ch.
    Kurt

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