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C Program To Find The Sum Of Diagonal Elements Of A Matrix.

The properties of any element Aij will be diagonal element if and only if i = j.

 #include<stdio.h>
int main(){

int a[100][100],i,j,sum=0,m,n;
printf("\nEnter the row and column of matrix: \n");
scanf("%d %d",&m,&n);

printf("\nEnter the elements of matrix: \n");
for(i=0;i<m;i++)
for(j=0;j<n;j++)
scanf("%d",&a[i][j]);
printf("\nThe matrix is\n");

for(i=0;i<m;i++){
printf("\n");
for(j=0;j<m;j++){
printf("%d\t",a[i][j]);
}}
for(i=0;i<m;i++){
for(j=0;j<n;j++){
if(i==j)
sum=sum+a[i][j];
}}
printf("\n\nSum of the diagonal elements of a matrix is: %d",sum);
return 0;
}
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