#include <stdio.h>
float add(float a, float b)
{
    return a + b;
}
int main()
{
    printf("Addition %f\n", add(2.343, 3.14));
    return 0;
}

kodingwindow@kw:~$ gcc kw.c
kodingwindow@kw:~$ ./a.out
Addition 5.483000
kodingwindow@kw:~$ 

#include <stdio.h>
void add()
{
    float a, b;
    printf("Enter the 1st Number ");
    scanf("%f", &a);
    printf("Enter the 2nd Number ");
    scanf("%f", &b);
    a = a + b;
    printf("Addition %f\n", a);
}
int main()
{
    add();
    return 0;
}

kodingwindow@kw:~$ gcc kw.c
kodingwindow@kw:~$ ./a.out
Enter the 1st Number 55
Enter the 2nd Number -10
Addition 45.000000
kodingwindow@kw:~$ 

#include <stdio.h>
float a, b, c;
void accept()
{
    printf("———————————————————————————————————————————");
    printf("\nProgram to perform the arithmetic operations");
    printf("\n———————————————————————————————————————————\n");
    printf("Enter the 1st number ");
    scanf("%f", &a);
    printf("Enter the 2nd number ");
    scanf("%f", &b);
}
float add(float a, float b)
{
    return a + b;
}
float sub(float a, float b)
{
    return a - b;
}
float mul(float a, float b)
{
    return a * b;
}
float division(float a, float b)
{
    return a / b;
}
int main()
{
    accept();
    printf("\nAddition      | %f\n", add(a, b));
    printf("Subtraction   | %f\n", sub(a, b));
    printf("Multiplication| %f\n", mul(a, b));
    printf("Division      | %f\n", division(a, b));
    printf("———————————————————————————————————————————\n");
    return 0;
}

kodingwindow@kw:~$ gcc kw.c
kodingwindow@kw:~$ ./a.out
———————————————————————————————————————————
Program to perform the arithmetic operations
———————————————————————————————————————————
Enter the 1st number 1
Enter the 2nd number 0

Addition      | 1.000000
Subtraction   | 1.000000
Multiplication| 0.000000
Division      | inf
———————————————————————————————————————————
kodingwindow@kw:~$