#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_LINE_LEN 1024

// Define a structure to hold student information
struct student {
  char name[MAX_LINE_LEN];
  int age;
  char class[MAX_LINE_LEN];
  float marks[6];
  float total;
}s;

int main(){
    FILE*ptr,*fptr;
    ptr=fopen("input.csv","r+");
        fptr=fopen("output.csv","w+");

    char c;
    c=fgetc(ptr);
    if(ptr==NULL){
        printf("file does not exist");
    }
    else{
        while(c!=EOF)
        {
            printf("%c",c);
            c=fgetc(ptr);
        }
    }
  

  

  // Read the first line of the input file (which contains the column headers)
  char line[MAX_LINE_LEN];
  fgets(line, MAX_LINE_LEN, ptr);

  // Loop through the rest of the lines in the input file
  while (fgets(line, MAX_LINE_LEN,ptr)) {
    // Create a student structure to hold the information for this line
    struct student s;

    // Parse the line and store the information in the student structure
    sscanf(line, "%[^,],%d,%[^,],%f,%f,%f,%f,%f,%f", s.name, &s.age, s.class,
           &s.marks[0], &s.marks[1], &s.marks[2], &s.marks[3], &s.marks[4],
           &s.marks[5]);

    // Calculate the total marks for this student
    s.total = 0;
    for (int i = 0; i < 6; i++) {
      s.total += s.marks[i];
    }


    // Write the information from the student structure to the output file
fprintf(fptr, "Name: %s\nAge: %d\nGender: %c\nGPA: %.2f\n",
            s.name, s.age);
  

  // Close the input and output files
  fclose(ptr);
  fclose(fptr);

  return 0;
}
}
by

C Language online compiler

Write, Run & Share C Language code online using OneCompiler's C online compiler for free. It's one of the robust, feature-rich online compilers for C language, running the latest C version which is C18. Getting started with the OneCompiler's C editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'C' and start coding!

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
}