In this, we will discuss C Program to Addition Subtraction, Multiplication and division: In this post, we will learn about how to perform addition, subtraction multiplication, division of any two numbers using if else statements in c programming. The program will request the user to enter two number digits and the user select an operator to perform the addition, subtraction, multiplication, and division of the entered number by the user and displays the output on the screen. The program will display the result according to the user selection.   Program: #include <stdio.h> #include <conio.h> int main () {     int a,b,n,s,m,d;     printf ( "Enter the first number :" );     scanf ( " %d " ,&a);     printf ( "Enter the second number :" );      scanf ( " %d " ,&b);     printf ( " Addition of two number is : %d \n " ,n=a+b );      printf ( "Subtraction of two number is : %d \n " ,s=a-b ...

  Marks                                       Grade  100-80                                       Distinction       79-60                                         First class  59-40                                         Second class  < 40                                           Fail               Program to calculate grade according to marks: Grade mark in c program: Write a program to read ...

Program to sum of series 1+1/2+1/3+1/4+....+1/n In this program, if inverse of a sequence follow rule A.P i.e , Arithmetic progression, then it is said to be in harmonic progression can be denoted:  1/a, 1/(a + d), 1/(a + 2d), 1/(a + 3d)........ , 1/(a + nd). As Nth term of AP is given as ( a + (n-1)d ). Hence, Nth term of harmonic progression is reciprocal of Nth term of AP, which is: 1/(a + (n-1)d) Where 'a' is the 1st term of AP and 'd' is the common difference. We can use a for loop to find sum.  Program: #include <stdio.h> #include <conio.h> int   main () { int   n , i , j , fact = 1 ; float   sum = 0 ; printf ( " \n  Enter Value of n : " ); scanf ( " %d " ,& n ); for ( i = 1 ; i <= n ; i ++) {      fact = 1 ;      for ( j = i ; j > 0 ; j --)     {          fact = fact  *  j ;   ...