#include<stdio.h>
#include<string.h>
struct mark_sheet
{
  char name[20];
  long int rollno;
  int marks[10];
  int total;
  float average;
  char status[10];
}
students[100];


int
main ()
{
  int a, b, n, result = 0;
  int status;
  printf ("How many students : \n");
  scanf ("%d", &n);
  for (a = 1; a <= n;a++)
    {
      printf ("\n\nEnter the details of %d student : ", n - a + 1);
      printf ("\n\nEnter student  %d  Name : ", a);
      scanf ("%s", students[a].name);
      printf ("\n\nEnter student %d Roll Number : ", a);
      scanf ("%ld", &students[a].rollno);
      students[a].total = 0;
      for (b = 1; b <= 5; b++)
	{
	  printf ("\n\nEnter the mark of subject-%d :  ", b);
	  scanf ("%d", &students[a].marks[b]);
	  students[a].total += students[a].marks[b];
	  if (students[a].marks[b] < 50)
	    result = 0;
	}
      students[a].average = (float) (students[a].total) / 5.0;
      if (result == 1)
	{strcpy (students[a].status, "Pass");}
      else
	strcpy (students[a].status, "Fail");
      result =1; }
  printf
    ("\n-----------------------------------------------------------------------------\n");
  {
    printf
      ("Reg.No  Name of student  Sub1  Sub2  Sub3  Sub4  Sub5  Total   Avg   Status\n");
  }
  printf
    ("\n----------------------------------------------------------------------------- \n");
  for (a = 1; a <= n; ++a)
    {
      {
	printf
	  (" %ld        %s         %d    %d    %d    %d    %d    %d    %.2f    %s ",
	   students[a].rollno, students[a].name, students[a].marks[1],
	   students[a].marks[2], students[a].marks[3], students[a].marks[4],
	   students[a].marks[5], students[a].total, students[a].average,
	   students[a].status);
      }
      printf
	("\n-----------------------------------------------------------------------------\n");

    }
  return (0);
}

C Language online compiler

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Read inputs from stdin

OneCompiler's C online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.

#include <stdio.h>
int main()
{
    char name[50];
    printf("Enter name:");
    scanf("%s", name);
    printf("Hello %s \n" , name );
    return 0;
    
}

About C

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.

Key features:

  • Structured Programming
  • Popular system programming language
  • UNIX, MySQL and Oracle are completely written in C.
  • Supports variety of platforms
  • Efficient and also handle low-level activities.
  • As fast as assembly language and hence used as system development language.

Syntax help

Loops

1. If-Else:

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.

2. Switch:

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;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
}

4. While:

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 
}

5. Do-While:

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);

Arrays

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.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

Functions

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

  1. Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

  1. User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

How to declare a Function

return_type function_name(parameters);

How to call a Function

function_name (parameters)

How to define a Function

return_type function_name(parameters) {  
  //code
}