Pascal Triangle using C Program

Program #39

Description:
Print Pascal Triangle using C Program

/*
C Program full source code for Pascal Triangle
Pascal Triangle using C program
Coding for Pascal Triangle
*/

#include <stdio.h>
#include <stdlib.h>
/* Global Declaration */
int n, x[25][25];
int main()
{
    /* Get Input value from User i.e. N */
    printf("Please enter the N value:\n");
    scanf("%d", &n);
   
    /* Local Prototype Declaration */
    void validateInput(void);
    void intializeDefaultValues(void);
    void fillRemainingValues(void);
    void printResultMatrixFormat(void);
    void printResultTriangleFormat(void);
   
    validateInput();
    intializeDefaultValues();
    fillRemainingValues();
    printResultMatrixFormat();
    printResultTriangleFormat();
    return 0;
   
}

/*
Function #1
-----------
Validate the Input value i.e N
*/
void validateInput() {
    if (n<1 || n > 25) {
        printf("Input is beyond this program Assumption !! \nPlease enter input value {1 to 25}\n");
        exit(0);
    }
}

/*
Function #2
-----------
Initialize default values
*/
void intializeDefaultValues(){
    int i;
   
    /* Fill default values in Row wise */
    for (i=1; i<=n; i++){
        x[i][1] = 1;
    }
   
    /* Fill default values in Column wise */
    for (i=1; i<=n; i++){
        x[1][i] = 1;
    }
   
    /*
      Note:
      In above code, we can use single FOR LOOP to initialize the Row/Column wise values.
      Just making it simplified; It is your wish to simply this code further.
    */
}

/*
Function #3
-----------
Fill remaining values
*/
void fillRemainingValues(){
    int i, j;
   
    for(i=2; i<=n; i++){
       
        for (j=2; j<=n; j++){
          
           /*
           Skip the x[i][j] position Summation
              if (i-1) is zero (or)
              if (j-1) is zero
           */
          
           if ( ((i-1) == 0) || ((j-1) == 0)){
               break;
           } else {
          
               /* Summation */
               x[i][j] = x[i][j-1] + x[i-1][j];
           }
          
        }
    }
}

/*
Function #4
-----------
Print Result in Matrix Format
*/
void printResultMatrixFormat(){
    int i,j;
   
    printf("\n\n");
    for (i=1; i<=n+1; i++){
        for (j=1; j<=n-i+1; j++){
            printf("%5d",x[i][j]);
        }
       
        printf("\n");
    }
}

/*
Function #5
-----------
Print Result in Triangle Format
*/
void printResultTriangleFormat(){
    int i,j,k;
   
    printf("\n\n");
    for (i=1; i<=n; i++){
       
        /*
        Identify the Row position
        To Print the result in Diagonal wise!!
        */
        k=i;
        for (j=1; j<=i; j++){
            printf("%5d",x[k][j]);
           
            /* Move towards Diagonally Upside */
            k--;
           
            /* Stop the Movement if it reaches 1st Row */
            if(k==0){
                /* Move Cursor to Next Row */
                printf("\n");
               
                /* Move to Next Row */
                break;
            }
        }
       
        printf("\n");
    }
}

Sample Output using Input value as 5:

Sample Output using Input value as 10: