C Program For SUM OF DIAGONAL ELEMENTS IN MATRIX

C Program For SUM OF DIAGONAL ELEMENTS IN MATRIX



In this program, we have a square matrix mat of maximum size 10 x 10. The variable 

size holds the value of size of matrix and the variable sum contains the sum of diagonal

 elements of the matrix mat. Now, first we ask the user to enter the size of the matrix

 and store the inputted value in the variable size. Next using a nested for loop we enter

 the values in the matrix mat.

CODE:
#include<stdio.h>
#include<conio.h>
void main()
{
int i,j,r,c,a[10][10],z=0;
clrscr();
printf("Enter the r and c");
scanf("%d%d",&r,&c);
for(i=1;i<=r;i++)
{
for(j=1;j<=c;j++)
{
printf("a[%d][%d]=",i,j);
scanf("%d",&a[i][j]);
}
}
for(i=1;i<=r;i++)
{
for(j=1;j<=c;j++)
{
printf("%d",a[i][j]);
}
printf("\n");
}
for(i=1;i<=r;i++)
{
for(j=1;j<=c;j++)
{
if(i==j)
{
z=z+a[i][j];
}
}
}
printf("sum of digonal elements=%d",z);
getch();
}