大家好，今天来说说字符的输入/输出。
// 从stream中读取字符int fgetc ( FILE * stream );int putc ( int character, FILE * stream );int getc ( FILE * stream );// 从stream中读取字符串char * fgets ( char * str, int num, FILE * stream );// 向stream中写入字符int fputc ( int character, FILE * stream );//int putc ( int character, FILE * stream );// 向stream中写入字符串int fputs ( const char * str, FILE * stream );// 从标准输入（stdio）读取一个字符int getchar ( void );// 从标准输入（stdio）读取一个字符串char * gets ( char * str );// putcharWrite character to stdout (function )putsWrite string to stdout (function )ungetcUnget character from stream (function )
让我们看一下示例代码。
#include <stdio.h>int ***in ( ) { FILE * pFile; int c; int n = 0; pFile=fopen ("myfile.txt","r"); if (pFile==NULL) perror ("Error opening file"); else { do { c = fgetc (pFile); if (c == '$') n++; } while (c != EOF); fclose (pFile); } return 0;}#include <stdio.h>int ***in(){ FILE * pFile; char mystring [100]; pFile = fopen ("myfile.txt" , "r"); if (pFile == NULL) perror ("Error opening file"); else { if ( fgets (mystring , 100 , pFile) != NULL ) puts (mystring); fclose (pFile); } return 0;}#include <stdio.h>int ***in (){ FILE * pFile; char c; pFile = fopen ("alphabet.txt","w"); if (pFile!=NULL) { for (c = 'A' ; c <= 'Z' ; c++) fputc ( c , pFile ); fclose (pFile); } return 0;}#include <stdio.h>int ***in (){ FILE * pFile; char sentence [256]; printf ("Enter sentence to append: "); fgets (sentence,256,stdin); pFile = fopen ("mylog.txt","a"); fputs (sentence,pFile); fclose (pFile); return 0;}#include <stdio.h>int ***in (){ int c; puts ("Enter text. Include a dot ('.')" " in a sentence to exit:"); do { c=getchar(); putchar (c); } while (c != '.'); return 0;}#include <stdio.h>int ***in(){ char string [256]; printf ("Insert your full address: "); // warning: unsafe (see fgets instead) gets (string); printf ("Your address is: %sn",string); return 0;}#include <stdio.h>int ***in () { char c; for (c = 'A' ; c <= 'Z' ; c++) putchar (c); return 0;}#include <stdio.h>int ***in () { char string [] = "Hello world!"; puts (string);}
今天就到这里，虽然上面的内容看起来很简单。
但是如果想用的自如，还是需要经常接触。
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