c语言或者符号怎么打（c语言入门代码大全）

大家好，今天和大家聊一下字符的输入/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 )

下面我们来看看实例代码。

#include <stdio.h>int main ( )  {  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 main(){   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 main (){  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 main (){   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 main (){  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 main(){  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 main ()  {  char c;  for (c = 'A' ; c <= 'Z' ; c++)     putchar (c);  return 0;}

#include <stdio.h>int main ()  {  char string [] = "Hello world!";  puts (string);}

今天的内容就这么多了，以上的内容虽然看起来简单。

但是，想要运用自如的话，还是需要大家勤加联系的。