File Handling : It is a way of performing operation on file using C language. operations are like creation of file, writing, appending, reading and etc.
Creating File: fopen() is used to open the file and it takes two arguments. First argument is the file pointer (name of file) we want to open and other argument refers to the mode in which we want to open our file.
There are Various modes;
- “r” – Opens the files only for reading
- “w”- Creates a new file only for writting
- “a”- Appends or write at the end of file
- “r+”- Open file for reading and writing both
- “w+”- Creates a new files if file doesn’t exist for writing. if file exists then its contents get overwritten. it also allow us to read the file.
- “a+”- Enable us to read the file and at the same time allows us to append/write at the end of file.
FILE *fp; filename=strcat(filename,".csv"); fp=fopen(filename,"w+");
Write Into the File: We can use fprintf function to write into the the file.
fprintf(fp,"Student Id, Microprocessor, RDMBMS, DCN, DS"); // used to for writing header into file fprintf(fp,"\n%d,%d,%d,%d,%d",id,micro,rd,dcn,ds); // used to write dynamic value
Here is Full code given below for creating and writing into that file. Enjoy 🙂
#include<stdio.h>
#include<string.h>
// function for creating and writing in file
void create_marks_csv(char *filename){
FILE *fp;
int i, count, id, micro, dcn, ds, rd;
printf("\n Creating %s.csv file",filename);
filename=strcat(filename,".csv");
fp=fopen(filename,"w+");
fprintf(fp,"Student Id, Microprocessor, RDMBMS, DCN, DS");
printf("How many student's marks do you want to save?");
scanf("%d", &count);
for(i = 1; i <= count; i++){
printf("Enter student id");
scanf("%d", &id);
printf("Enter Microprocessor marks");
scanf("%d", µ);
printf("Enter RDBMS marks");
scanf("%d", &rd);
printf("Enter DCN marks");
scanf("%d", &dcn);
printf("Enter DS marks");
scanf("%d", &ds);
fprintf(fp,"\n%d,%d,%d,%d,%d",id,micro,rd,dcn,ds);
}
fclose(fp);
printf("\n %sfile created",filename);
}
//main method
int main(){
char str[100];
clrscr();
printf("\n Enter the filename :");
gets(str);
create_marks_csv(str);
return 0;
}
If you want to learn more about the pointer, please do check my blog on Pointers. Hope you guys liked it. please let me know if you need any help. Thanks 🙂
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