Write your own functions. We know the programs we have seen before that is included only one function: main ( ) . But we can use one more prototype functions. How to use prototype function I just shown below.



#include<stdio.h>
void func1(void);
void func2(void);
void func3(void);
int main(void)
{
    printf("  What is your name: ?\n");
    func1();
    printf("  Where are you from: ?\n");
    func2();
    printf("  What is your university name: \n");
    func3();

    return 0;

}
void func1(void)
{
    printf("  My name is: Suruj \n");
}
void func2(void)
{
    printf("  I am from Kushtia \n");
}
void func3(void)
{
    printf("  United International University (UIU). \n");
}

Output

Also you can write down like this........................

#include<stdio.h>
 int main()
 {
     printf(" What is your name: ?\n\n");
     func1();

     return 0;

 }
 void func1(void)
 {
     printf(" My name is: Suruj. \n");

 }

Output

[N.B: If any body have any kinds of problem, then you can comment below. Thank you ]

Here I write a mixed code (additional & subtraction) both. Where I use 4 variable that is for integer number. If anyone wants to use floating point number or double number. Then just write float a,b,c,d,sum. then write your code and use %f  for taking your floating or double number. You can also use more variable that you want. If you have to need more variable then you have to use array[ ]. That is different.


#include<stdio.h>
int main()

{
    int a,b,c,d,mix;

    printf("Please enter your 1st value: ");
    scanf("%d",&a);
    printf("Please enter your 2nd value: ");
    scanf("%d",&b);
    printf("Please enter your 3rd value: ");
    scanf("%d",&c);
    printf("Please enter your 4th value: ");
    scanf("%d",&d);

    mix=a+b-c+d;
    printf("\nYour total number is: %d\n",mix);


    return 0;


}

[N.T: Please notice that I just change the sign of (+) or (-) and same code as addition and subtraction . ]

Output of above code.

Here I write a code for subtraction. Where I use 4 variable that is for integer number. If anyone wants to use floating point number or double number. Then just write float a,b,c,d,sum. then write your code and use %f  for taking your floating or double number. You can also use more variable that you want. If you have to need more variable then you have to use array[ ]. That is different.


#include<stdio.h>
int main()

{
    int a,b,c,d,sub;

    printf("Please enter your 1st value: ");
    scanf("%d",&a);
    printf("Please enter your 2nd value: ");
    scanf("%d",&b);
    printf("Please enter your 3rd value: ");
    scanf("%d",&c);
    printf("Please enter your 4th value: ");
    scanf("%d",&d);

    sub=a-b-c-d;
    printf("\nYour total number is: %d\n",sub);


    return 0;


}


[N.T: Please notice that I just change the sign of (+) to (-) and same code as addition. ]

Output of above code.

Here I write a code for addition. Where I use 4 variable that is for integer number. If anyone wants to use floating point number or double number. Then just write float a,b,c,d,sum. then write your code and use %f  for taking your floating or double number. You can also use more variable that you want. If you have to need more variable then you have to use array[ ]. That is different.



#include<stdio.h>
int main()

{
    int a,b,c,d,sum;

    printf("Please enter your 1st value: ");
    scanf("%d",&a);
    printf("Please enter your 2nd value: ");
    scanf("%d",&b);
    printf("Please enter your 3rd value: ");
    scanf("%d",&c);
    printf("Please enter your 4th value: ");
    scanf("%d",&d);

    sum=a+b+c+d;
    printf("\nYour total number is: %d\n",sum);


    return 0;


}

Output of above code.