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C - Writing to a File

Writing to a file allows a C program to save information for later use. Learn how to write formatted data with fprintf() and text with fputs().

fprintf() works like printf(), but sends the formatted output to a file instead of the screen.

Example01

CCode Cell

1	#include <stdio.h>
2
3	int main(void) {
4	FILE *fp = fopen("marks.txt", "w");
5
6	if (fp == NULL) {
7	printf("Could not open the file\n");
8	return 1;
9	}
10
11	fprintf(fp, "Rahul 88\n");
12	fprintf(fp, "Priya 95\n");
13
14	fclose(fp);
15	printf("Data written successfully\n");
16	return 0;
17	}

Output

Data written successfully

Use fputs() when you want to write a string. It does not add a new line automatically, so include \n if you need one.

Example02

CCode Cell

1	#include <stdio.h>
2
3	int main(void) {
4	FILE *fp = fopen("message.txt", "w");
5
6	if (fp == NULL) {
7	printf("Could not open the file\n");
8	return 1;
9	}
10
11	fputs("Welcome to C programming!\n", fp);
12	fclose(fp);
13
14	printf("Message saved\n");
15	return 0;
16	}

Output

Message saved

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