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pascalsTriangle.c
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pascalsTriangle.c
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#include <stdio.h>
//Computes the factorial of a number by using a for loop
int factorial(int n){
int fact = 1;
//Factorial of 0 is 1
if(n == 0){
return 1;
} else {
for(int i = 1; i <= n; i++){
fact = fact * i;
}
return fact;
}
}
//Computes the n choose r
int choose(int n, int r){
int answer;
//The calculation is assigned to an answer variable
answer = (factorial(n))/((factorial(r))*(factorial(n-r)));
return answer;
}
void triangle(int numOfRows) {
for(int n = 0; n < numOfRows; n++) {
for(int i = 1; i < numOfRows-n; i++) {
printf(" ");
}
for(int r = 0; r <= n; r++) {
printf(r == 0 ? "%d " : "%5d ", choose(n, r));
}
printf("\n");
}
}
int main(int argc, char **argv){
int rows;
printf("Enter the number of rows: ");
scanf("%d", &rows);
//Loops while user enters number between 0 (not inclusive) and 13 (inclusive)
while(rows > 0 && rows <=13){
//Goes into triangle function where it will print out the triangle
triangle(rows);
//Next prompt
printf("Enter the number of rows: ");
scanf("%d", &rows);
}
return 0;
}