C Program to Swap Two Numbers

Program:
This program is saved as Swap.c

#include <stdio.h> int main() { int x,y,temp; printf("Enter the value of x and y\n"); scanf("%d%d",&x,&y); printf("Before Swapping\nx=%d\ny=%d\n",x,y); temp = x; x = y; y = temp; /* using temp to swap storing x to temp and y to x then moving temp to y */ printf("After Swapping\nx=%d\ny=%d\n",x,y); return 0; }

Output:

Enter the value of x and y 86 134 Before Swapping x=86 y=134 After Swapping x=134 y=86

C Program to find greatest of three numbers

Program:
This program is saved as GreatestOfThree.c

#include <stdio.h> void main() { int a,b,c; printf("Enter any three numbers\n"); scanf("%d%d%d",&a,&b,&c); if(a>b&&a>c) /* if a is greater than b and c */ printf("Greatest number is : %d",a); else if(b>c) /* if not a than if b greater than c */ printf("Greatest number is : %d",b); else printf("Greatest number is : %d",c); }

Output:

Enter any three numbers 144 776 225 Greatest number is : 776

C Program to Add n numbers

Program:
This program is saved as Add.c

#include <stdio.h> int main() { int n,sum=0,c,value; printf("Enter the number of integers you want to add : "); scanf("%d",&n); printf("Enter %d integers\n",n); for(c = 1;c <= n;c++) { scanf("%d",&value); sum = sum + value; //adding each no. in sum } printf("Sum of entered integers = %d\n",sum); return 0; }

Output:

Enter the number of integers you want to add : 5 Enter 5 integers 45 15 28 3 16 Sum of entered integers = 107

C Program to Add Subtract Multiply and Divide the numbers

Program:
This program is saved as AddSubMulDiv.c 

#include<stdio.h> int main() { int first,second,add,subtract,multiply; float divide; printf("Enter two integers\n"); scanf("%d%d",&first,&second); add = first + second; subtract = first - second; multiply = first * second; divide = first/(float)second; //typecasting printf("Sum = %d\n",add); printf("Difference = %d\n",subtract); printf("Multiplication = %d\n",multiply); printf("Division = %.2f\n",divide); return 0; }

Type casting is a way to convert a variable from one data type to another data type. For example, if you want to store a long value into a simple integer then you can type cast long to int. You can convert values from one type to another explicitly using the cast operator.

New data type should be mentioned before the variable name or value in brackets which to be typecast.

Converting an expression of a given type into another type is known as type-casting . typecasting is more use in c programming language.

It is best practice to convert lower data type to higher data type to avoid data loss.

Data will be truncated when higher data type is converted to lower. For example, if float is converted to int, data which is present after decimal point will be lost.

Output:

Enter two integers 45 8 Sum = 53 Difference = 37 Multiplication = 360 Division = 5.63