Here is a program to demonstrate typecasting in C programming language.

#include
#include
void main(){
    float result;
    int num1, num2;
    clrscr();
    num1 = 10;
    num2 = 3;
    result = num1/num2;
    printf("\nBefore Typecasting: %f",result);
    /*
    As num1 and num2 are declared as int, it will return int value
    and it will get stored in the variable "result" as float i.e. 3.000000
    To solve this problem we can use typecasting.
    */
    result = (float)num1/num2;
    printf("\nAfter Typecasting: %f",result);
    getch();
}

Output:

Before Typecasting: 3.000000
After Typecasting: 3.333333