TYPES OF FUNCTIONS

1. TYPES OF FUNCTIONS M.S.P.V.L. Polytechnic College, Pavoorchatram.

2. Types • Function with no arguments and no return values • Functions with arguments and no return values • Function with no arguments and return values • Functions with arguments and return values

3. Function with no arguments and no return values • This is the simplest function. • This does not receive any arguments (data) from the calling function and does not return any value to the calling function.

4. Example main() { int a, b; ------- ------- message(); /*No actual arguments to send*/ ------- ------- } void message() /*No formal argument to receive*/ { ------- ------- return; /*No return value to the called function main*/ }

5. Program Write a program to find the sum of two numbers using function with no arguments and no return values. #include<stdio.h> main() { int sum(); sum(); } sum() { int i,j,x; scanf(“%d%d”,&i,&j); x=i+j; printf(“sum=%d”,x); return; }

6. Function with arguments and no return values • This function receives arguments (data) from the calling function and does not return any value to the calling function.

7. Example main() { int a,b; ------- ------- message(a,b); /*actual arguments to sent*/ -------- -------- } void message(x,y) /*formal arguments to receive*/ int x,y; /*formal arguments declaration*/ { -------- -------- return; /*no return value to the called function main*/ }

8. Program 1. Write a program to add two numbers using function with arguments and no return values. #include<stdio.h> main() { int sum(int, int); int i,j; scanf(“%d%d”, &i,&j); sum(i,j); } sum(x,y) int x,y; { int z; z=x+y; printf(“sum=%d”,z); return; }

9. 2. Write a program to find the square of first n natural numbers using function with arguments and no return values #include<stdio.h> main() { void square(int); int i,n; printf(“enter the value of n \n”); scanf(“%d”, &n); for(i=1;i<n;i++) square(i); } square(m); int m; { int temp; temp=m*m; printf(“%d/t%d/n”,m,temp); return; }

10. Function with no arguments and return values • This function does not receive arguments (data) from the calling function and return the computed value back to the calling function.

11. Example main() { int a,b; -------- -------- message(); } message() { int x,y value; ------- value=x+y return(value) }

12. write a ‘c’ program to find a square root of a number using a function. #include<stdio.h> #include<conio.h> #include<math.h> main() { float sqt(); float sqt(); float y; y=sqt(); printf(“\n square root value is:%f”,y); getch(); return; } /*function with no arguments and return value*/ float sqt() { float x; printf(“\n enter the number:”); scanf(“%f”,&x); return(sqrt(x)); } OUTPUT: Enter the number: 9 Square root value is: 3.000

13. Functions with arguments and return values • These functions receive arguments (data) from the calling function and return the computed value back to the calling function.

14. Example main() { int a,b; ------ ------ message (a,b); /*actual argument to send*/ } message (x,y) /*formal arguments to receive*/ int x,y; /*formal arguments declaration*/ { int vlaue; ----- value=x+y; return(value); /*this statement returns the value to the calling function*/ }

15. Programs • Write a program to add two numbers using function with arguments and return values. #include<stdio.h> main() { int sum(int,int); int i,j,value; scanf(“%d%d”,&i,&j); value=sum(i,j); printf(“sum=%d”,value); } sum(x,y) int x,y; { int z; z=x+y; return(z); }

16. 2. Write a program to find the square of numbers using function with arguments and return values #include<stdio.h> main() { int square(int); int i,n,value; printf(“enter the value of n \n”); scanf(“%d”,&n); for (i=0;i<=n;i++) { value=square(i); printf(“%d%d”,i,value); } } square(m) int m; { int temp; temp=m*m; return(temp); }

17. 3.Write a program to find the factorial of a given number using function with arguments and return values. #include<stdio.h> main() { int fact(int); int a,n; printf(“enter any integer number\n”); scanf(“%d”,&n); a=fact(n); printf(“the factorial as n=\n”,a); } fact(n) int n; { int vlaue i; value=1; if(n==0) return (value); else { for(i=1;i<n;i++) value=value*i; return(value); } }

18. 4. Write a program to find whether the given year is leap or not #include<stdio.h> in isleap(int y) { if(y%4==0) return 1; else return 0; } main() { int year; printf(“\nenter the year:”); scanf(“%d”,&year); if(isleap(year)) printf(“\nthe given year is leap year”); else printf(“\n the given year is not leap year”); getch(); }

19. The End Thank you