2.1 关于C程序第1行的包含语句，以下写法中正确的是______。
A:
B: includestdio.h
C:
D: include'stdio.h'
E:
F: include(stdio.h)
G:
H: include <;stdio.h>;
A:
B: includestdio.h
C:
D: include'stdio.h'
E:
F: include(stdio.h)
G:
H: include <;stdio.h>;
举一反三
- 使用库函数前包含头文件stdio。h的正确命令是（ ）。 A: @include<stdio.h> B: #include<stdio.h> C: #include stdio.h D: #include”stdio.h”
- 以下写法正确的有() A: B: include{stdio.h} C: D: include(stdio.h) E: F: include; G: H: include"stdio.h"
- 使用scanf()函数时，在源程序开头必须写预处理命令（ ） A: include <stdio.h> B: include <stdio > C: include <stdio.h> D: include <scanf.h>
- c程序实现输入输出的函数头文件是什么? A: stbin.h B: stdi.h C: stdio,h D: stdio.h
- 如果程序中用到标准库函数sqrt( )和strcmp( )，那么该程序应含下面哪两条语句( ) A: B: include “stdio.h” C: include “math.h” D: E: include “math.h” F: incluede “string.h” G: H: include “string.h” I: include “stdio.h” J: K: include “stdlib.h” L: include ”math.h”