Thread: Menu driven program

Your menu isn't in a loop, so why would it repeat?


Quzah.

Why are you calling main recursively?

Originally Posted by TheBigH

Why are you calling main recursively?

:/ i guess i dnt rly understand functions all that well. I figured since i want it to go back to the menu i should return main()

and okay i added a do while loop for the menu. im not sure why but if i put in 'a' and then the second time around put in 'q' it jus gets stuck on press any key to continue and wont exit

Code:

 do    {


scanf("%c",&choice);

        if(choice=='a')
        {
            a= func_a();
        }


        if(choice=='b')
        {
            b= func_b();
        }
        if(choice=='c')
        {
            c=func_c();
        }
    }
    while(choice!='q');
 system("PAUSE");
    return 0;

ok i fixed it up a bit and its workin well. the only thing i ask of one of u is to tell me how to bring the menu up(the printf stuff) everytime after it 'a' 'b' or 'c'

Code:

#include <stdio.h>
#include <stdlib.h>
#define txt "critpathinfo.txt"








int main()
{
    char choice;
    int a, b, c;
    


    printf("              Welcome to Critical Path Analysis              \n");
    printf("_____________________________________________________________\n");
    printf(" a --- print event number, maximum number of days for a task,\n       total number of days for the project completion.\n");
    printf("\n b --- print the event number and task number for all tasks\n       requiring more than 5 days.\n");
    printf("\n c --- print the number of each event, a count of number of tasks\n       within the even.\n");
    printf("\n q --- quit the program\n");
    printf("_____________________________________________________________\n");
    printf("         Please make your choice:  ");




    do
    {


        scanf("%c",&choice);

 switch(choice)
        {
            case 'a':
            a= func_a();
            break;


            case 'b':
            b=func_b();
            break;


            case 'c':
            c=func_c();
            break;
        }
    }
    while(choice!='q');


    system("PAUSE");
    return 0;






}


    int func_a()
    {


        int e, t, d;
        int event=1;
        int numdays=0;
        int totald=0;


        printf("\nEvent number       Max days\n");
        printf("===============================");
        FILE* data;


        data= fopen(txt,"r");
        if(data==NULL)
            printf("Error opening input file \n");
        else
        {


            while(fscanf(data,"%d%d%d",&e,&t,&d)==3)
            {
                if(event==e)
                {
                    if(d>numdays)
                        numdays=d;
                }
                else
                {
                    totald=totald + numdays;
                    printf("\n   %d                %d",event,numdays);
                    event=e;
                    numdays=d;
                }


            }
                 printf("\n   %d                %d",event,numdays);
                 totald=totald+numdays;
                 printf("\n===============================\n\n");
                 printf("\nTotal days to complete the project: %d\n",totald);
        }


        fclose(data);


    return 0;
    }




    int func_b()
    {
        int e, t, d;
        FILE* data;
        printf("\nEvent number     Task number\n");
        printf("===============================");


        data= fopen(txt,"r");
        if(data==NULL)
            printf("Error opening input file");
        else
        {
            while(fscanf(data,"%d%d%d",&e,&t,&d)==3)
            if(d>5)
                printf("\n   %d             %d",e,t);


        }
        printf("\n===============================\n");
    fclose(data);


    return 0;
    }


    int func_c()
    {
        int e, t, d;
        int event=1;
        int numtasks=0;
        FILE* data;
        printf("\nEvent number     Number of Tasks");
        printf("\n===============================");


        data= fopen(txt,"r");
        if(data==NULL)
            printf("Error opening input file \n");
        else
        {


            while(fscanf(data,"%d%d%d",&e,&t,&d)==3)
            {


                if(event==e)
                {   ++numtasks;
                    event=e;
                }
                else
                {   printf("\n   %d               %d",event,numtasks);
                    numtasks=1;
                    event=e;




                }


            }
        printf("\n   %d               %d",event,numtasks);
        }
        printf("\n===============================\n");
    fclose(data);


    return 0;
    }

Seems pretty obvious. If you need it to happen every time the loop happens, put it in the loop:

Code:

do
    show menu text
    ask for menu option
    read menu option
    do menu thing based on option
while menu option != quit

You just need to stop and think about what it is you are trying to do. Put it into word, then read it back, sometimes that's all it takes for it to click.


Quzah.

Take lines 19 to 26, and paste them into a new function called menu.

Code:

void menu ( void ) {
  // here
}

And call menu(); when you need to.