Program:
#include<stdio.h>
main()
{
int i,j,rows,col,trace=0;
printf("Enter number of rows and columns of a matrix\n");
scanf("%d %d",&rows,&col);
int a[rows][col];
if(rows==col)
{
//Taking input of matrix
printf("Enter Matrix 1\n");
for(i=0;i<rows;i++)
{
for(j=0;j<col;j++)
{
scanf("%d",&a[i][j]);
}
}
printf("Given /matrix is\n");
for(i=0;i<rows;i++)
{
for(j=0;j<col;j++)
{
printf("%d\t",a[i][j]);
}
printf("\n");
}
for(i=0;i<rows;i++)
{
trace+=a[i][i];
}
printf("Trace of above matrix is %d\n",trace);
}
else
{
printf("Trace is not possible \n");
}
}