A simple calculator written in C language and a C language Calculator

A simple calculator written in C language and a C language Calculator

Original version:

# Include <stdio. h>

Int checkPassword ();

Int add (int x, int y );

Int sub (int x, int y );

Int multi (int x, int y );

Float quo (float x1, float y1 );

Int com (int x, int y );

Int x, y;

Int result;

Int select;

Float result1;

Float x1, y1;

Int success, psw;

Int;

Int I;

Int t;

 

 

Void main ()

{

Printf ("enter the password \ n ");

I = 0;

Do {

Scanf ("% d", & );

 

If (! = 1234 & I <2)

Printf ("enter the password again: \ n ");

Else

I = 3;

I ++;

} While (I <= 2 );

If (a = 1234)

{

For (t = 1; t! = 6; t = select)

{

 

Printf ("+ =============================================+ \ n ");

Printf ("+ ======== computer = Main = dishes = single =======+ \ n ");

Printf ("+ =============================================+ \ n ");

Printf ("+ ============= 1, addition =============+ \ n ");

Printf ("+ ============= 2, subtraction ===============+ \ n ");

Printf ("+ = 3, multiplication = 3, multiplication = + \ n ");

Printf ("+ ============= 4, Division =============+ \ n ");

Printf ("+ ============= 5, remainder ===============+ \ n ");

Printf ("+ ============= 6, exit ===============+ \ n ");

Printf ("+ =============================================+ \ n ");

 

 

Printf ("Enter your choice: \ n ");

Scanf ("% d", & select );

 

Switch (select)

{

Case 1:

Printf ("enter two numbers: \ n ");

Scanf ("% d", & x, & y );

Result = add (x, y );

Printf ("% d + % d = % d \ n", x, y, result );

Break;

Case 2:

Printf ("enter two numbers: \ n ");

Scanf ("% d", & x, & y );

Result = sub (x, y );

Printf ("% d-% d = % d \ n", x, y, result );

Break;

Case 3:

Printf ("enter two numbers: \ n ");

Scanf ("% d", & x, & y );

Result = multi (x, y );

Printf ("% d * % d = % d \ n", x, y, result );

Break;

Case 4:

Printf ("enter two numbers: \ n ");

Scanf ("% f", & x1, & y1 );

Result1 = quo (x1, y1 );

Printf ("% f/% f = % f \ n", x1, y1, result1 );

Break;

Case 5:

Printf ("enter two numbers: \ n ");

Scanf ("% d", & x, & y );

Result = com (x, y );

Printf ("% d/% d = % d \ n", x, y, result );

Break;

Case 6:

Break;

Default:

Printf ("Enter 1 ~ Number between 5 \ n ");

Break;

 

 

}

}

}

}

Int add (int x, int y)

{

Int sum;

Sum = x + y;

Return sum;

}

Int sub (int x, int y)

{

Int sub;

Sub = x-y;

Return sub;

}

Int multi (int x, int y)

{

Int multi;

Multi = x * y;

Return multi;

}

Float quo (float x, float y)

{

Float quo;

Quo = x/y;

Return quo;

}

Int com (int x, int y)

{

Int com;

Com = x % y;

Return com;

}

Int checkPassword (int psw)

{

If (psw = 1234)

Success = 1;

Else

Success =-1;

Return success;

}

 

 

 

 

 

After revision:

 

 

# Include <stdio. h>

Int yanzheng (int );

Void caidan ();

Void jiafa (int, int );

Void jianfa (int, int );

Void chengfa (float, float );

Void chufa (float, float );

Void mo (int, int );

 

Void main (){

Int x, m;

Int y;

Float a, B;

Printf ("enter the password \ n ");

Scanf ("% d", & x );

M = yanzheng (x );

If (m = 1 ){

Caidan ();

// Int y;

// Float a, B;

For (; y! = 6 ;){

Printf ("Enter the option: \ n ");

Scanf ("% d", & y );

If (y> = 1 & y <6 ){

Printf ("enter two numbers to calculate: \ n ");

Scanf ("% f", & a, & B );

}

 

Switch (y ){

Case 1: jiafa (a, B); break;

Case 2: jianfa (a, B); break;

Case 3: chengfa (a, B); break;

Case 4: chufa (a, B); break;

Case 5: mo (a, B); break;

Case 6: break;

Default: printf ("option input error! Please try \ n "); break;

}

}

}

}

 

 

Int yanzheng (int x ){

Int I, m;

For (I = 1, m = 0; I <3; I ++ ){

If (x == 1234 ){

M = 1;

Break;

}

Printf ("Please try again :");

Scanf ("% d", & x );

}

Return m;

}

 

Void caidan (){

Printf ("+ =============================================+ \ n ");

Printf ("+ ======== computer = Main = dishes = single =======+ \ n ");

Printf ("+ =============================================+ \ n ");

Printf ("+ ============= 1, addition =============+ \ n ");

Printf ("+ ============= 2, subtraction ===============+ \ n ");

Printf ("+ = 3, multiplication = 3, multiplication = + \ n ");

Printf ("+ ============= 4, Division =============+ \ n ");

Printf ("+ ============= 5, remainder ===============+ \ n ");

Printf ("+ ============= 6, exit ===============+ \ n ");

Printf ("+ =============================================+ \ n ");

}

 

Void jiafa (int x, int y ){

Int sum;

Sum = x + y;

Printf ("% d \ n", sum );

}

 

Void jianfa (int x, int y ){

Int cha;

Cha = x-y;

Printf ("% d \ n", cha );

}

 

Void chengfa (float x, float y ){

Float ji;

Ji = x * y;

Printf ("% f \ n", ji );

}

 

Void chufa (float x, float y ){

Float shang;

Shang = x/y;

Printf ("% f \ n", shang );

}

 

Void mo (int x, int y ){

Int mo;

Mo = x % y;

Printf ("% d \ n", mo );

}