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RafaI've written the function for a 3x3 matrix. In 3x3 upper triangular matrix, there are 3 elements whose value is 0 (i < j).. So, when count is 3, program will display that matrix is upper triangular. You can modify the function as per your matrix size.
void upper() // Function for finding Upper Triangular Matrix
{
int count = 0;
printf("\nEnter a matrix ");
for(i = 0; i <= 2; i++)
for(j = 0; j <= 2; j++)
scanf("%d", &a[i][j]);
for(i = 0; i <= 2; i++)
{
for(j = 0; j <= 2; j++)
{
if(i <= j)
{
if(a[i][j] == 0)
count++;
}
}
}
if(count == 3)
printf("\nThe Matrix is upper triangular\n");
else
printf("\nThe Matrix is not upper triangular\n");
}
int main() // Main Function
{
upper();
)
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