Example: fwrite
The following example gives values to a student record, sd, and then writes it to a file using fwrite.
#include <stdio.h>
#ifdef unix char * filename = "/tmp/marks.txt"; #else char * filename = "c:\\marks.txt"; #endif
struct student_data { int student_id; unsigned char marks[10]; };
FILE* file; struct student_data sd; int i;
if ((file = fopen(filename, "w+")) == NULL) { lr_output_message ("Unable to create %s", filename); return -1; }
sd.student_id = 1001;
// Set the marks of student 1001
for (i = 0; i < 10; i++) sd.marks[i] = (unsigned char)(85 + i);
// Write student record to the file
i = fwrite(&sd, sizeof(struct student_data), 1, file); if (i > 0) lr_output_message ("Successfully wrote %d record", i);
fclose(file);
Example: Output:
Successfully wrote 1 record