C Tutorial/stdio.h/putc
putc
Item Value Header file stdio.h Declaration int putc(int ch, FILE *stream); Function writes a character to the output stream. Return returns the character written on success and EOF on error.
For binary mode, you can use ferror() to determine whether an error has occurred.
#include <stdio.h>
int main(void){
FILE *fp;
if((fp=fopen("test", "w"))==NULL) {
printf("Cannot open file.\n");
exit(1);
}
char *str = "www.java2s.com";
for(; *str; str++){
putc(*str, fp);
}
}