can somebody help me this code cannot run. I can't find the error...

#include <stdio.h>
#include <conio.h>
#include <ctype.h>
#include<stdlib.h>     //use for fflush and exit(0)
#include<string.h>     //use for strcpy

void calculate();
void insert();
void exit();

#define TRUE 1


void calculate_and_sort(int end_of_file);

int input1;
char ch;
typedef struct{
int num;
char matrix[20];
double midterm;
double final;
double total;
char grade[10];
}input_t[30];
input_t input;

main()
{
char file_name[100];
int i = 0;
int condition2 = 0;
int condition = 0;
int end_of_file = 0;
char output_file_name[100];
int limit=3;



	do
	{

	printf("\n________________________________________________________________________________");
    printf("\n\n\t\tWELCOME TO OUR SYSTEM \n\n");
	printf("__________________________________________________________________________________\n\n");

	FILE *inp,
	  *outp;

do{
	end_of_file = 0;

	fflush(stdin);  //flush off buffer

	do{
		printf("\nInsert file name to manipulate the file data (out of %d): ",limit);
		gets(file_name);

		inp = fopen(file_name,"r");

		if(inp == NULL){

			printf("\n     '%s' doesn't exist...\n", file_name);
			limit--;

				if(limit == 0){
					printf("\n\nSession end... more than 3 times inserting the invalid file name...");
					exit(0);
				}

		}
	}while(inp == NULL);



	limit=3;

	while( fscanf(inp, "%d%s%lf%lf", &input[i].num, &input[i].matrix, &input[i].midterm, &input[i].final) != EOF ){
	end_of_file++;
	i++;
	}
	//show scanned result...............................................................................................................
	printf("\nResult Scanned\n");
	printf("No\tMatrix\t  Midterm  Final\n");

	for(i=0; i<end_of_file; i++){
	printf("%d\t%s\t  %.2f\t   %.2f\n",input[i].num, input[i].matrix, input[i].midterm, input[i].final);
	}
	//show scanned result...............................................................................................................



    printf( "\t\t1. CALCULATE\n\n" );
    printf( "\t\t2. INSERT OTHER FILES\n\n" );
	printf( "\t\t3. EXIT\n\n");
    printf( "\tPlease Enter Your Selection: ");
	scanf("%d",&input);

	ch=toupper( getche() );

	switch (input1) {
        case 1 :
				 printf("\n__________________________________________________________________");
				 printf("\n\n\t\t CALCULATE \n\n");
			   	 printf("____________________________________________________________________\n\n");

			printf("\nTo Calculate, Sort and Save... press '1'... ");
			scanf("%d",&condition2);

			fflush(stdin);  //flush off buffer
			if(condition2 == 1){
			calculate_and_sort(end_of_file);

		printf("\nInsert output file name (please include the file extention '_.txt'): ");
		gets(output_file_name);
		outp = fopen(output_file_name, "w");
		fprintf(outp, "No\tMatrix\t  Total\t  Grade\n");

		for(i=0; i<end_of_file; i++){
			fprintf(outp, "%d\t%s\t  %.2f\t  %s\n",input[i].num, input[i].matrix, input[i].total, input[i].grade);
		}

	}

	//calculating..........................................................................................................
		printf("\nCalculated : \n");
		for(i=0; i<end_of_file; i++){

		input[i].total = input[i].midterm + input[i].final;

		if(input[i].total >= 80 && input[i].total <= 100 ){
			sprintf(input[i].grade, "A");
		}
		else if(input[i].total >= 75 ){
			sprintf(input[i].grade, "A-");
		}
		else if(input[i].total >= 70 ){
			sprintf(input[i].grade, "B+");
		}
		else if(input[i].total >= 65 ){
			sprintf(input[i].grade, "B");
		}
		else if(input[i].total >= 60 ){
			sprintf(input[i].grade, "B-");
		}
		else if(input[i].total >= 55 ){
			sprintf(input[i].grade, "C+");
		}
		else if(input[i].total >= 50 ){
			sprintf(input[i].grade, "C");
		}
		else if(input[i].total >= 45 ){
			sprintf(input[i].grade, "C-");
		}
		else if(input[i].total >= 40 ){
			sprintf(input[i].grade, "D+");
		}
		else if(input[i].total >= 35 ){
			sprintf(input[i].grade, "D");
		}
		else if(input[i].total < 35 ){
			sprintf(input[i].grade, "E");
		}
		else
			sprintf(input[i].grade, "Error");
	}

	printf("No\tMatrix\t  Total\t  Grade\n");
	for(i=0; i<end_of_file; i++){
	printf("%d\t%s\t  %.2f\t  %s\n",input[i].num, input[i].matrix, input[i].total, input[i].grade);
	}



				 break;

        case  2:
				 printf("\n___________________________________________________________________");
				 printf("\n\n\t\t INSERT OTHER FILES \n\n");
			   	 printf("_____________________________________________________________________\n\n");

				 fflush(stdin);  //flush off buffer

	if(condition2 == 1){

		calculate_and_sort(end_of_file);

		printf("\nInsert output file name (please include the file extention '_.txt'): ");
		gets(output_file_name);

      outp = fopen(output_file_name, "w");

		fprintf(outp, "No\tMatrix\t  Total\t  Grade\n");

		for(i=0; i<end_of_file; i++){
			fprintf(outp, "%d\t%s\t  %.2f\t  %s\n",input[i].num, input[i].matrix, input[i].total, input[i].grade);

	}
                 break;


		 case 3: printf("\n\n\t\tProgram finished     ");
                 break;

       default:  printf("\n\n\t\tIncorrect choice. Try again\n\n");
				 printf("\t\t----------------------------------------------------------\n\n\n");
                 continue;
    }
	if(input1==3)break;
	}
     getch();
}

kalau nda mau tolong sudah!!!!! macam la ko pandai betul!!! bajingan betul!!!

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