//Keven Hyppolite
//EGN3211
//Homework7B
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
FILE *hwdfp;
//hardware dat file pointer
struct hws{
//hardware structure
int rn;
//record number
char ts[30];
//tools in the struct
int quantity;
//quantity of tools
double cost;
//cost of tools
};
//struct for the hardware
int yourchoice(void);
//This will ask the questions
void storetxt(FILE *reader);
//This will store the text
//reader points to file type
void UPDATE(FILE *fPtr);
//This function will update the function
void ADD(FILE *fPtr);
//Adds to record
void DELETE(FILE *fPtr);
//Delete's record
int main(){
FILE *hwdfp;
int choice;
if((hwdfp = fopen("hardware.dat", "rb+")) == NULL){
printf("File could not be opened.\n");
}else{
while ((choice = yourchoice()) != 9){
switch (choice){
case 1:
storetxt(hwdfp);
break;
//stores formatted txt file
case 2:
UPDATE(hwdfp);
break;
//update
case 3:
ADD(hwdfp);
break;
//add
case 4:
DELETE (hwdfp);
break;
//delete
default:
printf("Invalid Input\n");
break;
//9 terminates program, everything else in invalid
}
}
fclose(hwdfp);
}
return 0;
}
//main function controls switch
//Input 9 will terminate program
void storetxt(FILE *reader){
FILE *txt;
//pointer to txt file
struct hws hardware = {0, "", 0,0.0};
//intialized structre variables
if ((hwdfp = fopen("hardware.txt", "rb+")) == NULL ){
printf("File could not be opened.\n");
}else{
rewind(reader);
fprintf(txt, "%-6s%-10s%-8s%-8s\n",
"Record#", "Tool name", "Quantity", "Cost");
while (!feof(reader)){
fread(&hardware, sizeof(struct hws),1, reader );
if (hardware.rn != 0){
fprintf(txt, "%d%s%d%0.2f\n", hardware.rn, hardware.ts,
hardware.quantity, hardware.cost);
}
}
fclose(txt);
}
}
void UPDATE (FILE *fPtr){
int record;
struct hws hardware = {0, "", 0,0.0};
printf("Enter record to update (0-100): ");
scanf("%d", &record);
fseek(fPtr, (record - 1) *sizeof(struct hws), SEEK_SET);
fread(&record, sizeof(struct hws), 1, fPtr);
if (hardware.rn == 0){
printf( "Record #%d has no information.\n", record);
}else{
printf("Enter new tool name, quantity,cost \n?");
scanf("%s%d%f", hardware.ts, hardware.quantity, hardware.cost);
fseek(fPtr, (record - 1) *sizeof(struct hws), SEEK_SET);
fwrite(&hardware, sizeof(struct hws), 1, fPtr);
}
}
//Update Record, basically changing variables
void DELETE(FILE *fPtr){
struct hws hardware;
struct hws remover = {0, "", 0,0.0};
int rn;
printf( "Enter record number to delete (0-100): ");
scanf("%d", &rn);
fseek(fPtr, (rn - 1) *sizeof(struct hws), SEEK_SET);
fread(&hardware, sizeof(struct hws), 1,fPtr);
if (hardware.rn == 0){
printf ("Record %d does not exist.\n", rn);
}else{
fseek(fPtr,(rn - 1) *sizeof(struct hws), SEEK_SET);
fwrite(&remover, sizeof(struct hws), 1, fPtr);
}
}
//Delete's New record
void ADD(FILE *fPtr){
struct hws hardware = {0, "", 0,0.0};
int rn;
printf("Enter record number to create (1-100) : ");
scanf("%d", &rn);
fseek(fPtr, (rn - 1) *sizeof(struct hws), SEEK_SET);
fread(&hardware, sizeof(struct hws), 1, fPtr);
if(hardware.rn != 0){
printf("Record already exists");
}else{
printf("Enter tool name, quantity, cost\n");
scanf("%s%d%0.2f", hardware.ts, hardware.quantity, hardware.cost);
fseek(fPtr,(rn - 1) *sizeof(struct hws), SEEK_SET);
fwrite(&hardware, sizeof(struct hws), 1, fPtr);
}
//Enter data you want to ADD
}
//Adds new record
int yourchoice(void){
int ch;
printf("%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n\n%s",
"Your choices are:",
"1 - STORE a formatted text file of inventoried tools called",
" hardware.txt for printing", "2 - UPDATE a tool record",
"3 - ADD a new tool record", "4 - DELETE a tool record",
"5 - DISPLAY a tool record", "9 - END program", "Enter your choice: ");
scanf("%d", &ch);
return ch;
}
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switch(conditional-expression) {
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for(Initialization; Condition; Increment/decrement){
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return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
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}