# C Exercises: Find the sum of upper triangular elements of a matrix

## C Array: Exercise-74 with Solution

Write a program in C to find the sum of the upper triangular elements of a matrix.

**Pictorial Presentation:**

**Sample Solution:**

**C Code:**

```
#include <stdio.h>
int main()
{
int R, C, n, r, c, sum=0;
int arr1[3][3]={{1, 2, 3},
{4, 5, 6},
{7, 8, 9}};
R = C = n = 3;
int i,j;
//------------- print original array ------------------
printf("The given array is : \n");
for(i = 0; i < R; i++)
{
for (j=0;j<C;j++)
{
printf("%d ", arr1[i][j]);
}
printf("\n");
}
//------------------------------------------------------
printf("The elements being summed of the upper triangular matrix are: ");
for(r = 0; r < R; r++)
{
for(c = 0; c < C; c++)
{
if(r < c)
{
printf("%d ",arr1[r][c]);
sum += arr1[r][c];
}
}
}
printf("\nThe Sum of the upper triangular Matrix Elements are: %d", sum);
return 0;
}
```

Sample Output:

The given array is : 1 2 3 4 5 6 7 8 9 The elements being summed of the upper triangular matrix are: 2 3 6 The Sum of the upper triangular Matrix Elements are: 11

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## C Programming: Tips of the Day

**C Programming - What is the argument for printf that formats a long?**

Put an l (lowercased letter L) directly before the specifier.

unsigned long n; long m; printf("%lu %ld", n, m);

Ref : https://bit.ly/3dIwfkP

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