C File Handling

Function	Purpose
`fopen(name, mode)`	Open a file ("r", "w", "a", "r+", "rb" …)
`fprintf / fscanf`	Formatted write / read
`fputc / fgetc`	Character write / read
`fgets / fputs`	Line read / write
`fclose(fp)`	Close the file

#include <stdio.h>
int main() {
    FILE *fp = fopen("data.txt", "w");
    if (fp == NULL) { printf("Cannot open file\n"); return 1; }
    fprintf(fp, "Roll: %d\nName: %s\n", 7, "Ravi");
    fclose(fp);

    char line[100];
    fp = fopen("data.txt", "r");
    while (fgets(line, sizeof line, fp) != NULL)
        printf("%s", line);
    fclose(fp);
    return 0;
}

Roll: 7 Name: Ravi

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