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This is my first time posting anything, but anyway, I am very new to C programming. I have to write a programme (like a calculator) that takes the user from the main menue to a sub menue of the user's choice. Then from that menue the user would pick a type of math or computation, conversion etc. (ex. find the factorial of a number, find the sqaure root of a number etc)
After the computation is done I can make the programme go back to the sub menue but I DONT KNOW how to go from the sub-menue BACK to the main menue!
I mean, that when you press the relevant number for "EXIT" (to the main menue) in the sub-menue it doesnt go to the main meneu! I dont know how to call the main function!
Please help!
p.s the smiley that comes at the VERY end of the programme is actually the variable "b" I dont know how it keeps changing into a smiley!
//Programme for main menue
#include<stdio.h>
#include<conio.h>
#include<math.h>
//prototyping
void basic_function(void);
void trigonometry(void);
void conversions(void);
void matrix_math(void);
void other_functions(void);
void string_functions(void);
int main()
{
main_menue:
clrscr();
char selection;
printf("*****************************[+] [-] [*] [/] [%]********************************\n\t\t\t\tHello There!\n\n\t WELCOME TO 'Fun with Math' Calculator\n\t\t\t (*FUM CAL* for short!)\n");
printf("\n To get started with our calculator, please select one of the following options.");
printf("\n\n\t\t[1] Basic Functions\t[2] Trigonometry\n\n\n\t\t[3] Conversions\t\t[4] Matrix Math\n\n\n\t\t[5] Other Functions\t[6] String Functions");
printf("\n\n\n\t\t\t\t [7] Exit");
printf("\n\n\n\t\tPlease Enter your selection here : ");
scanf("%c",&selection);
switch(selection)
{
case'1':clrscr();printf("\n\n\t\t You have chosen [1] - Basic Functions");basic_function();break;
case'2':clrscr();printf("\n\n\t\t You have chosen [2] - Trigonometry");trigonometry();break;
case'3':clrscr();printf("\n\n\t\t You have chosen [3] - Conversions");break;
case'4':clrscr();printf("\n\n\t\t You have chosen [4] - Matrix Math");break;
case'5':clrscr();printf("\n\n\t\t You have chosen [5] - Other Function");break;
case'6':clrscr();printf("\n\n\t\t You have chosen [6] - String Functions");break;
case'7':clrscr();printf("\n\n\n\n\t\t\t You have chosen [7] - Exit");
printf("\n\n\n\n\t\t We hope you have ENJOYED using our 'FUM CAL'\n\n\n\n\t\t\t Thank you for using 'FUM CAL' \n\n\n\n\t\t\t Good bye! and Take Care!\n\n\n\t\t\t ");break;
default: clrscr();printf("\n\n\n\n\t\t\t ERROR - INVALID SELECTION!\n\n\t\t\t\tDear User!\n\n\t\tEither you typed in a value other than 1 - 7\n\n\t\t\t\t\ OR\n\n\t\t You have not read the User Guide carefully!");
fflush(stdin);printf("\n\n\n\t If you wish to go back to the Main menue (I am sure you do!)\n\n\n\t\t press ENTER KEY to go there: ");
getchar();goto main_menue;
}
return(0);
}
void basic_function()
{
void factorial();
void square_root();
void power();
void invert();
{
fflush(stdin);
bf_menue:
clrscr();
int n,i,answer;
char option;
printf("\n\t\t\t Basic Functions Menue!");
printf("\n\n\n\n\n\t\t[1] Factorial of n\t[2] Square root of n\n\n\n\n\t\t[3] X to the power Y\t[4] Invert n\n\n\n\n\t\t\t\t [5] Exit");
printf("\n\n\n\n\n\t\tChoose what Basic Function you wish to check : ");
scanf("%c",&option);
switch(option)
{
case'1':clrscr();printf("\n\n\t\t You have chosen [1] - Factorial of n");factorial();break;
case'2':clrscr();printf("\n\n\t\t You have chosen [2] - Square root of n");square_root();break;
case'3':clrscr();printf("\n\n\t\t You have chosen [3] - X to the power Y");power();break;
case'4':clrscr();printf("\n\n\t\t You have chosen [4] - Invert n");invert();break;
case'5':clrscr();printf("\n\n\t\t You have chosen [5] - Exit");break;
default: clrscr();printf("\n\n\n\n\t\t\t ERROR - INVALID SELECTION!\n\n\t\t\t\tDear User!\n\n\t\tEither you typed in a value other than 1 - 5\n\n\t\t\t\t\ OR\n\n\t\t You have not read the user manual carefully!");
fflush(stdin);printf("\n\n\n If you wish to go back to the Basic Functions menue (I am sure you do!)\n\n\n\t\t press ENTER KEY to go there: ");
getchar();goto bf_menue;
}
}
}
//1.1 Factorial
void factorial()
{
long int n;
printf("\n\n\n\n\n\n\n\t Enter the number you want to search for factorial: ");
scanf("%ld",&n);
long int answer=n;
int i=1;
while(i<n)
{
answer=(n-i)*answer;
i++;
}
printf("\n\n\n\n\t\t\tFactorial of %ld! = %d",n,answer);
fflush(stdin);
printf("\n\n\n\n\n\t Press Enter to go back to Basic Function Menue : ");
getchar();
basic_function();
}
//1.2 Square root of n
void square_root()
{
float number,a,b=1,c=1;
printf("\n\n\n\n\n\n\t\t Enter a number greater than 1: ");
scanf("%f",&number);
while(b==1)
{
a=c*c;
if(a>=number)
{
break;
}
c=c+0.000001;
}
printf("\n\n\n\n\n\t\t The Square Root of %.2f is %.5f\n",number,c);
fflush(stdin);
printf("\n\n\n\n\n\t\tPress Enter to go back to Basic Function Menue : ");
getchar();
basic_function();
}
//1.3 X to the power Y
void power()
{
int number,power;
printf("\n\n\n\n\n\t Enter the number you wish to know the power of : ");
scanf("%d",&number);
printf("\n\n\n\n\t\t\t Enter the power : ");
scanf("%d",&power);
int answer=number;
int i=1;
while(i<power)
{
answer=number*answer;
i++;
}
if(power==0)
{
answer=1;
}
printf("\n\n\n\n\t\t\t %d to the power %d = %d",number,power,answer);
printf("\n");
fflush(stdin);
printf("\n\n\n\n\t\tPress Enter to go back to Basic Function Menue : ");
getchar();
basic_function();
}
//Invert n
void invert()
{
float number;
double answer;
{
printf("\n\n\n\n\n\t What is the number that you wish to know the Invert of : ");
scanf("%f",&number);
answer = 1/number;
printf("\n\n\n\n\t\t The Invert of %f is %f",number,answer);
fflush(stdin);
printf("\n\n\n\n\n\t\tPress Enter to go back to Basic Function Menue : ");
getchar();
basic_function();
}
}
//2 Trigonometry
void trigonometry()
{
int sel;
double j;
float i,a,b,c;
printf("\n\n\n\n\t\t 1. Degrees\t2. Radians\n\n");
printf("\n\n\t\t Select the type you want: ");
scanf("%d",&sel);
switch(sel)
{
case 1: printf("\n\n\n\t\t Enter value in degrees: ");
scanf("%lf",&j);
i = (j * (22/7))/180;
a = sin(i);
printf("\n\t\t Sin %f = %f \n",j,a);
b = cos(i);
printf("\t\t Cos %f = %f \n",j,
;c = tan(i);
printf("\t\t Tan %f = %f \n",j,c);
break;
case 2: if(sel==2) printf("\n\n\t\t Enter value in radians:");
scanf("%f",&i);
a = sin(i);
printf("\n\t\t\t Sin %f = %f \n",i,a);
b = cos(i);
printf("\t\t\t Cos %f = %f \n",i,
;c = tan(i);
printf("\t\t\t Tan %f = %f \n",i,c);
break;
}
fflush(stdin);
printf("\n\n\n\t\tPress Enter to go back to Main Menue : ");
getchar();
}
CALCULATOR_SAMPLE.txt (6.85K)
Number of downloads: 42
CALCULATOR_SAMPLE.txt (6.85K)
Number of downloads: 42
This post has been edited by tomspencer: 01 June 2009 - 01:35 PM
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