# Upside Down Triangle Printing In C

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A triangle with all sides equal is called equilateral triangle. We shall now see how to print stars *, in equilateral triangle shape, but upside-down.

## Algorithm

Algorithm should look like this −

```Step 1 - Take number of rows to be printed, n.
Step 2 - Make an iteration for n times
Step 3 - Print " " (space) for in decreasing order from 1 to n-1
Step 4 - Print "* " (start, space) in increasing order from 1 to I
Step 5 - Return
```

## Pseudocode

We can derive a pseudocode for the above mentioned algorithm, as follows −

```procedure upsidedown_triangle

FOR I = 1 to N DO
FOR J = 1 to N-I DO
PRINT " "
END FOR

FOR J = 1 to I DO
PRINT "* "
END FOR
END FOR

end procedure
```

## Implementation

Implementation of equilateral triangle upside-down in C is as follows −

```#include <stdio.h>

int main() {
int n,i,j;

n = 5;

for(i = 1; i <= n; i++) {
for(j = 1; j < i; j++)
printf(" ");

for(j = i; j <= n; j++)
printf("* ");

printf("\n");
}

return 1;
}
```

The output should look like this −

```* * * * *
* * * *
* * *
* *
*
```
patterns_examples_in_c.htm