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  1. //Q78, Find the sum of main diagonal elements for a square matrix.
  2.  
  3. #include <stdio.h>
  4. int main() {
  5.     int n,a[10][10],i,j,sum=0;
  6.     scanf("%d",&n);
  7.     for(i=0;i<n;i++)
  8.         for(j=0;j<n;j++){
  9.             scanf("%d",&a[i][j]);
  10.             if(i==j) sum += a[i][j];
  11.         }
  12.     printf("%d", sum);
  13. }
  14.  
Success #stdin #stdout 0.01s 5324KB
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stdin
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3 3
1 2 3
4 5 6
7 8 9
stdout
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15
https://ideone.com/6i6qS2
language:
C (gcc 8.3)
created:
21 hours ago
visibility:
public

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