**Write a program to take a number from a user and send it to a function to find and print the cube of the number**

//send the number into the function and print the cube of the number in the function itself #include<stdio.h> #include<conio.h> void cube(int); void main() { clrscr(); int i; printf("Enter number for which you want to find cube\n"); scanf("%d",&i); cube(i); getch(); } void cube (int x) { int cube; cube=x*x*x; printf("cube is %d",cube); }

**Similarly, write a program to calculate the cube of a number in a function and print the result in the main function**

//send number to function and print cube in the main function #include<stdio.h> #include<conio.h> int cube(int); void main() { int i,cube1; clrscr(); printf("Enter number you want the cube of\n"); scanf("%d",&i); cube1=cube(i); printf("Cube is %d",cube1); getch(); } int cube(int x) { int cube1; cube1=x*x*x; return(cube1); }

**Write a program to send the radius of a circle to a function, calculate its area and print the result in the main function**

//send radius of a circle to a function and print area in the main function #include<stdio.h> #include<conio.h> float area(int); void main() { clrscr(); int i; float areacircle; printf("Enter radius of the circle\n"); scanf("%d",&i); areacircle=area(i); printf("Area is %0.2f",areacircle); getch(); } float area(int x) { float areaofcircle; areaofcircle=3.14*x*x; return(areaofcircle); }

**Now, write a program to send the radius of five circles to a function, calculate their areas and print the result in the main function**

//take in radius of five circles and calculate area using function #include<stdio.h> #include<conio.h> float area(int); void main() { clrscr(); int a,b,c,d,e; printf("Enter radius of circle 1\n"); scanf("%d",&a); printf("Enter radius of circle 2\n"); scanf("%d",&b); printf("Enter radius of circle 3\n"); scanf("%d",&c); printf("Enter radius of circle 4\n"); scanf("%d",&d); printf("Enter radius of circle 5\n"); scanf("%d",&e); printf("Area of circle is %0.2f\n",area(a)); printf("Area of circle is %0.2f\n",area(b)); printf("Area of circle is %0.2f\n",area(c)); printf("Area of circle is %0.2f\n",area(d)); printf("Area of circle is %0.2f\n",area(e)); getch(); } float area(int u) { float A1; A1=3.14*u*u; return(A1); }

**Write a program to read a four-digit number and send it to a function to add the digits. Print the result in the main function.**

//four digit positive integer entered from keyboard, write a function to add the digits #include<stdio.h> #include<conio.h> int sum(int); void main() { clrscr(); int a,addition; printf("Enter four digit positive number\n"); scanf("%d",&a); addition=sum(a); printf("The sum of the digits is %d",addition); getch(); } int sum(int x) { int a,b,c,sumdigit; a=x%10; x=x/10; b=x%10; x=x/10; c=x%10; x=x/10; sumdigit = a+b+c+x; return(sumdigit); }

**WAP with a function to calculate the factorial of a number. Print the result in the main function.**

//write a function to calculate factorial of a number #include<stdio.h> #include<conio.h> int factorial(int); void main() { clrscr(); int a; printf("Enter number for which factorial is to be found\n"); scanf("%d",&a); printf("The factorial of this number is %d", factorial(a)); getch(); } int factorial(int x) { int product=1,a; for(a=x;a>1;a--) { product=product*a; } return(product); }

**Write a program with a function to reverse the number entered by a user. Print the result in the main function.**

//write a program to reverse the number entered by a user #include<conio.h> #include<stdio.h> #include<math.h> int reverse(int); void main() { clrscr(); int x; printf("Enter a number to be reversed\n"); scanf("%d",&x); printf("The reversed number is %d",reverse(x)); getch(); } int reverse(int a) { int b, newnum=0; while(a>0) { b=a%10; a=a/10; newnum=newnum*10+b; //IKFT } return(newnum); }

**Write a program with a function to calculate the highest common factor (HCF)/Greatest common divisor (GCD) of two numbers. Print the result in the function itself.**

//write a function to calculate the GCD/HCF of two numbers #include<stdio.h> #include<conio.h> void gcd(int,int); void main() { clrscr(); int a, b; printf("Enter the two numbers you wish to calculate the GCD/HCF of\n"); scanf("%d%d",&a,&b); gcd(a,b); } void gcd(int m, int n) { int c,x,z; float y; for(c=1;c<=m;c++) { x=m%c; y=n%c; if(x==0 && y==0) { z=c; } } printf("greatest cd is %d",z); getch(); }