#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
#define MAX_sno 30
struct product{
int sno;
char name[10];
int batchno;
int mfd;
int exp;
};
struct product * createproduct(struct product *ptr,char name[20],int mfd,int exp,int price){
static int i=1;
ptr->batchno = i;
strcpy(ptr->name,name);
ptr->mfd = mfd;
ptr->exp = exp;
ptr->price = price;
i++;
return ptr;
}
int file_read(struct train **trains){
int count=0;
FILE *fpr;
fpr = fopen("train_details.txt","r");
while(fread(trains[count],sizeof(struct train),1,fpr)){
count++;
}
fclose(fpr);
return count;
}
void file_write(struct train **trains, int count){
int i; FILE *fpw;
remove("train_details.txt");
fpw = fopen("train_details.txt","w");
for(i=0;i<count;i++){
fwrite(trains[i],sizeof(struct train),1,fpw);
}
fclose(fpw);
}
int main(){
int ch,id,count=0,i,new_count=0;
char type;
char sp[20],ep[20];
struct train * trains[100];
count = file_read(trains);
while(1){
printf("\n------------------------------------------------------------------------");
printf("\n---------------------------Train Reservation------------------------------");
printf("\n------------------------------------------------------------------------");
printf("\n");
printf("\n1. Add Train\n2. Display Trains\n3. Book Ticket\n4. Cancel Ticket\n5. Exit\n\nChoose your option: ");
scanf("%d",&ch);
switch(ch){
case 1:
printf("\n\n-----------Add Train-------------\n");
printf("\nEnter the train id: ");
scanf("%d",&id);
fflush(stdin);
printf("\nEnter the type: ");
scanf("%c",&type);
printf("\nEnter the starting point: ");
scanf("%s",sp);
printf("\nEnter the destination point: ");
scanf("%s",ep);
trains[count] = createtrain(id,type,sp,ep);
count++printf("\nTrain added succesfully.");
getch();
system("cls");
break;
case 2:
printf("\n\n---------Present Trains----------\n");
if(count==0)
printf("Currently no trains are present.");
else{
for(i=0;i<count;i++){
printf("\nTrain Id: %d",trains[i]->train_id);
printf("\nType: %c",trains[i]->type);
printf("\nSeats Filled: %d",trains[i]->seats);
printf("\nStarting Point: %s",trains[i]->sp);
printf("\nDestination Point: %s",trains[i]->ep);
printf("\n");
}
}
getch();
system("cls");
break;
case 3:
printf("\n\n---------Book a Ticket----------\n");
printf("\nEnter the train id: ");
scanf("%d",&id);
i = 0;
while(trains[i]->train_id!=id&&i<count)
i++;
if(i<count){
if(trains[i]->seats<MAX_SEATS){
trains[i]->seats+=1;
printf("\nTicket booked successfully.\n");
printf("\nYour ticket: \n");
printf("\n\n*****************");
printf("\n* Adult - 1 *");
printf("\n* Train Id - %d *",id);
printf("\n*****************\n");
}
else
printf("Sorry the train is full.");
}
else
printf("\nInvalid train id.\n");
getch();
system("cls");
break;
case 4:
printf("\n\n---------Cancel a Ticket----------\n");
printf("\nEnter the train id: ");
scanf("%d",&id);
i = 0;
while(trains[i]->train_id!=id&&i<count)
i++;
if(i<count){
if(trains[i]->seats>0){
trains[i]->seats-=1;
printf("\nOne ticket cancelled successfully.\n");
}
else
printf("Sorry the train is empty.");
}
else
printf("\nInvalid train id.\n");
getch();
system("cls");
break;
case 5:
file_write(trains,count);
exit(1);
}
}
}
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#include <stdio.h>
int main()
{
char name[50];
printf("Enter name:");
scanf("%s", name);
printf("Hello %s \n" , name );
return 0;
}
C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.
When ever you want to perform a set of operations based on a condition if-else is used.
if(conditional-expression) {
// code
} else {
// code
}
You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to if-else-if ladder.
switch(conditional-expression) {
case value1:
// code
break; // optional
case value2:
// code
break; // optional
...
default:
// code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
// code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.
data-type array-name[size];
data-type array-name[size][size];
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Two types of functions are present in C
Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,
User defined functions are the ones which are written by the programmer based on the requirement.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
//code
}