米6体育平台手机版

SLAU132V October 2004 – February 2020

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7.2.1 High-Level I/O Functions

The high-level functions are the standard C library of stream I/O routines (printf, scanf, fopen, getchar, and so on). These functions call one or more low-level I/O functions to carry out the high-level I/O request. The high-level I/O routines operate on FILE pointers, also called streams.

Portable applications should use only the high-level I/O functions.

To use the high-level I/O functions, include the header file stdio.h, or cstdio for C++ code, for each module that references a C I/O function.

For example, given the following C program in a file named main.c:

#include <stdio.h>

void main()
{
   FILE *fid;

   fid = fopen("myfile","w");
   fprintf(fid,"Hello, world\n");
   fclose(fid);

   printf("Hello again, world\n");
}

Issuing the following compiler command compiles, links, and creates the file main.out from the run-time-support library:

cl430 main.c --run_linker --heap_size=400 --library=rts430_eabi.lib --output_file=main.out

Executing main.out results in

Hello, world

being output to a file and

Hello again, world

being output to your host's stdout window.