How can I write int value Binary and txt file in C? - c

Question

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
struct student
{
int stuNum;
int point;
};
int newStudent(FILE* dataf, FILE* indexf);
int main(void)
{
FILE* datafile;
FILE* indexfile;
indexfile = fopen("indexDosyasi.txt", "a+");
datafile = fopen("veriDosyasi.bin", "wb+");
newStudent(datafile, indexfile);
fclose(datafile);
fclose(indexfile);
return 0;
}
int newStudent(FILE* dataf, FILE* indexf)
{
indexf = fopen("indexfile.txt", "a+"); // txt file
dataf = fopen("datafile.bin", "wb"); // binary file
if (dataf == NULL)
{
printf("error");
return -1;
}
struct student* last = (struct student*)malloc(sizeof(struct student));
printf("number of student \n");
scanf("%d", last->stuNum);
fprintf(indexf, "%d\t", last->stuNum);
fwrite(last, sizeof(struct student), 1, dataf);
// fwrite(&last->stuNum,sizeof(struct student),1,dataf);
return 0;
}
Hi , i am trying student add system with c , my datafile have to be binary file and my indexfile have to be txt file , stuNum and point have to be int value but i cant add stunum and point into datafile and indexfile , i dont understand how can i add ? i read a lot answer about this question but i didnt find answer i want .When i run this code and enter the student number is 875,it says 66955608268424 in the indexfile(txt) and it says �*~ in the datafile(binary).i cant understand where is mistake?
Can you help me?

Answer 1

Try this way:
int newStudent(...)
{
write(fileName, "what you want to write", strlen("what you want to write"))
}
And if it doesn't works, try to tranform your int to a character string. I thing it is the itoa() or atoi() function.