# C program to explain how fmod and modf function works

### C program to explain how fmod and modf works :

In this C programming tutorial, we will learn how *fmod* and *modf* function works, what arguments these functions take and what are the return values. Function *fmod* is defined as :

double fmod(double x,double y)

Similarly, the function *modf* is defined as :

double modf(double x,double *y)

Now, let’s see how *fmod* works :

*double fmod(double x,double y)* takes two *double* variables *x and y* and returns the remainder found by *dividing x by y*.

Similarly, the function *double modf(double x,double *y)* divides a number into its integer and fraction parts.Let’s take a look at the program to understand both of these functions :

### C program :

#include<stdio.h> #include<math.h> int main(){ //1 double firstNumber; double secondNumber; //2 double number; double fractionPart; double intPart; //3 printf("Enter the first number : "); scanf("%lf",&firstNumber); //4 printf("Enter the second number : "); scanf("%lf",&secondNumber); //5 printf("fmod(firstNumber,secondNumber) is %lf \n",fmod(firstNumber,secondNumber)); //6 printf("Enter another number : "); scanf("%lf",&number); //7 fractionPart = modf(number,&intPart); printf("Interger component : %lf\n",intPart); printf("Fraction component : %lf\n",fractionPart); }

### Explanation :

1. Create two *double* variables to store two numbers.

2. Create three more *double* variables to store the number, its integer part, and its fraction part.

3. Ask the user to enter the first number. Read it and store it in *firstNumber* variable.

4. Similarly, ask the user to enter the second number, read and store it in *secondNumber* variable.

5. Print the *fmod* value of the *firstNumber* and *secondNumber*.

6. Ask the user to enter another number for *modf*. Read and store it in *number* variable.

7. Find out the *fractionPart* by passing the *number* and *address of intPart* to the *modf* function.It will store the integer part in *intPart* variable.

8. Print both integer and fraction component of the number.

### Sample Output :

Enter the first number : 12 Enter the second number : 5 fmod(firstNumber,secondNumber) is 2.000000 Enter another number : 12.334 Interger component : 12.000000 Fraction component : 0.334000

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