C语言sscanf和sprintf的用法及实例

近来编程要用到这两个函数，这里结合MSDN以及自己的使用，对这两个函数作一下简要说明，加深对这两个函数的理解！

sscanf:

int sscanf( const char *buffer, const char *format [, argument ] ... );

Example/* SSCANF.C: This program uses sscanf to read data items·  from a string named tokenstring, then displays them. */#include <stdio.h>void main( void ){char  tokenstring[] = “15 12 14...”;char  s[81];char  c;int   i;float fp;/* Input various data from tokenstring: */sscanf( tokenstring, “%s”, s );sscanf( tokenstring, “%c”, &c );sscanf( tokenstring, “%d”, &i );sscanf( tokenstring, “%f”, &fp );/* Output the data read */printf( “String    = %s\n”, s );printf( “Character = %c\n”, c );printf( “Integer:  = %d\n”, i );printf( “Real:     = %f\n”, fp );}OutputString    = 15Character = 1Integer:  = 15Real:     = 15.000000

sprintf:

int sprintf( char *buffer, const char *format [, argument] ... );

Example/* SPRINTF.C: This program uses sprintf to format various* data and place them in the string named buffer. */#include <stdio.h>void main( void ){char  buffer[200], s[] = “computer”, c = ‘l’;int   i = 35, j;float fp = 1.7320534f;/* Format and print various data: */j  = sprintf( buffer,     “\tString:    %s\n”, s );j += sprintf( buffer + j, “\tCharacter: %c\n”, c );   j += sprintf( buffer + j, “\tInteger:   %d\n”, i );   j += sprintf( buffer + j, “\tReal:      %f\n”, fp );printf( “Output:\n%s\ncharacter count = %d\n”, buffer, j );}OutputOutput:String:    computerCharacter: l   Integer:   35   Real:      1.732053character count = 71

以下就是我编程时候用到的，希望对看到的朋友有帮助：

#include <stdio.h>#include <stdlib.h>void main( void ){char buffer[1024];int i, ch;//getcharprintf( "Enter a line: " );for( i = 0; (i < 1024) &&  ((ch = getchar()) != EOF) && (ch != '\n'); i++ )buffer[i] = (char)ch;buffer[i] = '\0';//printf( "%s\n", buffer );char* username = (char*)malloc(30);char* password = (char*)malloc(32);//sscanfsscanf( buffer, "netdisk -u%s -p%s", username, password );printf( "username = %s\n", username );printf( "password = %s\n", password );//sprintfchar* sql = (char*)malloc(1024);sprintf(sql, "select * from `user` where `username` = '%s'", username);printf( "sql = %s\n", sql );}