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In this C program we will calculate the nPr or nCr and print the result, in the screen. The choice will be taken from the user. User can calculate nCr or nPr by choice. If you are new in nPr or nCr and want to know about nPr or nCr ,please, click below : https://gradestack.com/Complete-CAT-Prep/Permutation-and/Meaning-and-Derivation-of/19142-3882-35788-study-wtw input: User's Choice. (i.e. 1.for nPr and 2.for nCr) & then, objects(n) and samples(r). output: The Calculated result will be printed on the screen. CODE----> #include<stdio.h> #include<conio.h> #include<math.h> #include<stdlib.h> int npr () ; int ncr () ; int fact (int num3 ) ; main() {      int choice;      printf( " *********Menu*********\n " ) ;      printf( " 1.nPr\n2.nCr\n\n " ) ;      printf( " Please, Enter Your Choice : " ) ;      scanf( " %d ",&choice ) ;      if( choice==1 )    

In this C program we will calculate the multiplication of two numbers(integers) using addition method and print the result, in the screen. The two numbers(integers) will be taken from the user. input: The two numbers(integers) (i.e. 5,10,7 etc.) output: The multiplication of the two numbers will be printed on the screen. CODE----> #include<stdio.h> #include<conio.h> main() {      int num1,num2,mul=0,i=1;      printf (" Enter the first number : ");      scanf (" %d ",&num1);      printf (" \nEnter the second number : ");      scanf (" %d ",&num2);      while( i<=num1 )      {          mul=mul+num2;          i++;      }      printf (" \n\n The result is : %d * %d = %d ",num1,num2,mul);      getch(); } Don't just read, write it, run it..... RESULT :