Thread: Need big help with a menu program

I have a problem in "c" programing. I have to make a program organized as a menu, a program which reads text files, records the results in a file ( the user has to enter the names of both files) and has these capabilities:
- Determines the longest word, which consists of letters only;
- Determines the common letters in each line;
- Can change one digit with another;
- Determines the longest and shortest line in the file.
Can you please help me? At least for one of the following points....
Thx in advance!

i tried the one with the longest word coz i cant write the others

Code:

 void longest_word(FILE *f,FILE *f1)
   {    
          char data[2000];
            int i,len=0,len1=0,k=0;
     for(i=0;i<2000;i++)
     {   
      if(data[i]==EOF) break;
      data[i]=fgetc(f);
      if((data[i]>='a'&&data[i]<='z')||(data[i]>='A'&&data[i]<='Z'))
       {   len++;}
       else if(len>len1)
       {len1=len; k = i-len; len=0;}
      }
    printf("%d",s1);
    for(i=k;i<k+len1;i++)
     printf("%c",data[i2]);
     i++;  
   }

dont know if its good thou

oki this is what i got but i cant make all of them run as they should

Code:

#include"stdafx.h"
#include<conio.h>
#include<stdio.h>
#include<math.h>
#include<string.h> 
#include<stdlib.h>
#include<ctype.h>

    int choice(void);   // izbor na jelanata ot potrebitelq operaciq 
	void longest_word(FILE *f,FILE *f1);
	void change_word(FILE *f,FILE *f1);	
	void longest_row(FILE *f,FILE *f1); //	Определяне броят на думите на всеки ред 
	

    int main()		// glavnata fynkciq 

    {  
	   char mass[40],mass1[40];
	   FILE *p,*p1;
	   int choicee;

		printf("Enter file name that you want to write\n");
		gets(mass1);
		 if((p=fopen("C:\\Users\\Tzvetelin\\Desktop\\Ceco\\Ceco.txt","rt"))== NULL){
			printf("Error while reading:");
			getch();
			return 1;
		}
		if(!(p1=fopen(mass1,"wt"))){
			printf("Error while reading %s",mass1);
			getch();
		   return 2 ; 
		}

	   do {
		choicee=choice();
 
	   switch(choicee){
		   case 1:longest_word(p,p1);break;
			   case 2: change_word (p,p1);break;
				   case 3: longest_row(p,p1);break;
		   default: printf("You enter wrong number,please try again... \n");
	       }
	   }
	     while(choicee<1||choicee>4);
	      getch();
	      return 0;
		}


        int choice(void) 
	  {    int a;
		  printf("1Determination of the longest word consisting only of letters\n");
		  printf("2.Change number\n");
		  printf("3.Longest row\n");
		  printf("4.Determination of the longest and the shortest line in the file\n");
		  printf("Enter number of your selection\n");
		  scanf("%d",&a);
		  return a;
	  }


      void longest_word(FILE *f,FILE *f1)
   {    
          char data[2000];
            int i,len=0,len1=0,k=0;
     for(i=0;i<2000;i++)
     {   
      if(data[i]==EOF) break;
      data[i]=fgetc(f);
      if((data[i]>='a'&&data[i]<='z')||(data[i]>='A'&&data[i]<='Z'))
       {   len++;}
       else if(len>len1)
       {len1=len; k = i-len; len=0;}
      }
  
    for(i=k;i<k+len1;i++)
     fprintf(f1,"%c",data[i]);
	     i++;  
   }


	   void change_word(FILE *f,FILE *f1)
	   {  int a1,a,tr;
              
              for(;;)
		   {  	if(fscanf(f,"%d",&a1)==EOF)break;
			     
			  if(a1 >=32 && a1<=47 || a1>=58&& a1<=127)tr=0;
			    else
				{
					printf("Vuvedete 4islo:\n");
					scanf("%d",&a);
			        a1=a;
			    }
              fprintf(f1,"%d\t",a1);
			  }
			  rewind(f);
	   }

	   void longest_row(FILE *f,FILE *f1)
	    {  int k=0,br=0,br1=0,k1=0,a1; 
	        int j=0,j1=0,b1;

			for(;;)
			 {  if((a1=fgetc(f))==EOF)break;
				 br++;
				 if(a1=='\n')
				   {  k++;
					 if(br>br1)
				 { br1=br;k1=k;br=0;}
			      }
			}

			fprintf(f1,"nai dulgiq red e %d \n",k1);

              rewind(f);


               br=0;
			for(;;)
			{  if((b1=fgetc(f))==EOF)break;
				
					br1=1000;
				 br++;
				 if(b1=='\n')
				   {  j++;
					 if(br<br1)
				 { br1=br;j1=j;br=0;}
				 }
			}

			fprintf(f1,"nai kusiq red e %d\n",j1);
	   }

can you help now ? pls