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File Handling Operation In C Language

CSZONE #include<stdio.h> #include<stdlib.h> #include<string.h> FILE *f; int insert(); int read(); int count(); int main(){     int ch;        system("clear");     printf("\n\t\tFile Handling");        printf("\n\t\tMenu");     printf("\n\t\t1.Write ");     printf("\n\t\t2.Read");     printf("\n\t\t3 Count ");         printf("\n\t\tEnter Your Choice : ");     scanf("%d",&ch);         switch(ch){                 case 1 : insert();                 break;         case 2 : read();                 break;         case 3 : count();                 break;         default: printf("\n\t\tYou Have Entered Wrong Choice.. Try Again...");                 exit(0);     }     return 0;     } int insert(){         char ch[500];         f = fopen("File.c","w");         if(f==NULL){         printf("\n\t\tFile Opening Error.