c-style字符字符串_C字符串-能力问题与解答

c-style字符字符串

C programming String Aptitude Questions and Answers: In this section you will find C Aptitude Questions and Answers on Strings, String is the set of characters and String related Aptitude Questions and Answers you will find here.

C编程String Aptitude问答：在本节中，您将找到有关字符串的C Aptitude问答，String是字符集，与String相关的Aptitude问答在这里可以找到。

1) What will be the output of following program ?

#include <stdio.h>
#include <string.h>
int main()
{
int val=0;
char str[]="IncludeHelp.Com";
val=strcmp(str,"includehelp.com");
printf("%d",val);	
return 0;
}

0
1
-1
Error

Answer

Correct Answer - 3
-1
Strings are not equal, hence strcmp will return -1.

1)以下程序的输出是什么？

0
1个
-1
错误

回答

正确答案-3
-1
字符串不相等，因此strcmp将返回-1。

2) What will be the output of following program ?

#include <stdio.h>
#include <string.h>
int main()
{
char str[];
strcpy(str,"Hello");
printf("%s",str);
return 0;
}

Hello
Error
No Output
Null

Answer

Correct Answer - 2
Error: 'str' Unknown Size
At the time of str declaration, size is empty, it may be possible when you are initializing string with declaration (like char str[]="Hello";

2)以下程序的输出是什么？

你好
错误
无输出
空值

回答

正确答案-2
错误：“ str”未知大小
在str声明时，size为空，当您使用声明初始化字符串时(例如char str [] =“ Hello”;

3) What will be the output of following program ?

#include <stdio.h>
int main()
{
char str[8]="IncludeHelp";
printf("%s",str);
return 0;
}

IncludeHelp
IncludeH
Error
No Output

Answer

Correct Answer - 3
Error: Too many initializers/ array bounds overflow.

3)以下程序的输出是什么？

包括帮助
包含H
错误
无输出

回答

正确答案-3
错误：初始化程序/数组边界过多。

4) What will be the output of following program ?

#include <stdio.h>
#include <string.h>
int main()
{
char str1[]="IncludeHelp",str2[]=".Com";
printf("%s",str1+strlen(str2));
return 0;
}

IncludeHelp.Com
udeHelp
Error
IncludeHelp4

Answer

Correct Answer - 2
udeHelp
Look the expression str1+strlen(str2)=> str1+4, since str1 is a character array, and str1+4 will point 4th index of str1, then udeHelp will print.

4)以下程序的输出是什么？

IncludeHelp.Com
udeHelp
错误
包括帮助4

回答

正确答案-2
udeHelp
查看表达式str1 + strlen(str2)=> str1 + 4，因为str1是一个字符数组，并且str1 + 4将指向str1的第4个索引，然后将输出udeHelp。

5) What will be the output of following program ?

#include <stdio.h>
int main()
{
char str[]="Hello%s%dFriends";
printf(str);
printf("\n");
printf("%s",str);
return 0;
}

HelloFriends
HelloFriends
Hello%s%dFriends
Hello%s%dFriends
Hello(null)0Friends
Hello%s%dFriends
Garbage Value

Answer

Correct Answer - 3
Hello(null)0Friends
Hello%s%dFriends
printf("%s",str); prints all string, but printf(str) prints the value instead of %s, %d .. etc (default value for %s is null and %d is 0.

5)以下程序的输出是什么？

你好朋友
你好朋友
你好％s％dFriends
你好％s％dFriends
您好(空)0个朋友
你好％s％dFriends
垃圾价值

回答

正确答案-3
您好(空)0个朋友
你好％s％dFriends
printf(“％s”，str); 打印所有字符串，但printf(str)打印该值，而不是％s，％d等。(％s的默认值为null，％d为0。

6) What will be the output of following program ?

#include <stdio.h>
int main()
{
int i;
char str[]="IncludeHelp";
for(i=0;str[i]!='\0';i++)
{
putchar(str[i]); 
putchar('*');
}
return 0;
}

Answer

I*n*c*l*u*d*e*H*e*l*p*
.

6)以下程序的输出是什么？

回答

I * n * c * l * u * d * e * H * e * l * p *
。

7) What will be the output of following program ?

#include <stdio.h>
int main()
{
char str[]="value is =%d";
int a='7';
str[11]='c';
printf(str,a);
return 0;
}

value is =%d
value is =%c
value is =55
value is =7

Answer

Correct Answer - 4
value is =7
We can assign '7' into integer variable a, a will be 55, but str[11]='c' statement will replace 11th character of str 'd' to 'c', hence str will be "value is =%c.
and statement printf(str,a); will print "value is=7".

7)以下程序的输出是什么？

值是=％d
值是=％c
值是= 55
值= 7

回答

正确答案-4
值= 7
我们可以将'7'分配给整数变量a，a将为55，但是str [11] ='c'语句会将str'd'的第11个字符替换为'c'，因此str将为“ value is =％c 。
和语句printf(str，a); 将显示“值is = 7”。

8) What will be the output of following program ?

#include <stdio.h>
int main()
{
char result,str[]="\0IncludeHelp";
result=printf("%s",str);
if(result)
printf("TRUE");
else
printf("FALSE");
return 0;
}

\0IncludeHelpTRUE
\0IncludeHelpFALSE
Error
FALSE

Answer

Correct Answer - 4
FALSE
str[]="\0IncludeHelp", str will be terminated by \0.

8)以下程序的输出是什么？

\ 0IncludeHelpTRUE
\ 0包括HelpFALSE
错误
假

回答

正确答案-4
假
str [] =“ \ 0IncludeHelp”，str将以\ 0终止。

9) What will be the output of following program ?

#include <stdio.h>
#include <string.h>
int main()
{
if( printf("Hello") == strlen("Hello") )
printf("...Friends");
else
printf("...Enemies");
return 0;
}

Hello...Friends
Hello...Enemies
...Friends
...Enemies

Answer

Correct Answer - 1
Hello...Friends
Statement printf("Hello") will print "Hello" and return 5, and statement strlen("Hello") will return total number of characters (5) , hence condition is true.

9)以下程序的输出是什么？

你好朋友
你好...敌人
...朋友
...敌人

回答

正确答案-1
你好朋友
语句printf(“ Hello”)将打印“ Hello”并返回5，语句strlen(“ Hello”)将返回字符总数(5)，因此条件为true。

10) What will be the output of following program ?

#include <stdio.h>
#include <string.h>
int main()
{
char s1[]="IncludeHelp";
char s2[10];
strncpy(s2,s1,5);
printf("%s",s2);
return 0;
}

Inclu
IncluGARBAGE_VALUE
Error
IncludeHelp

Answer

Correct Answer - 2
IncluGARBAGE_VALUE
strncpy is used to copy number of characters from one string to another...
strncpy(s2,s1,5) will move 5 characters from s1 to s2, but there is no NULL ('\0') character to terminate the string s2...IncluGARBAGE_VALUE will print.

10)以下程序的输出是什么？

包含
IncluGARBAGE_VALUE
错误
包括帮助

回答

正确答案-2
IncluGARBAGE_VALUE
strncpy用于将字符数从一个字符串复制到另一字符串...
strncpy(s2，s1,5)将5个字符从s1移至s2，但是没有NULL('\ 0')字符可终止字符串s2。 将显示IncluGARBAGE_VALUE。

11) What will be the output of following program ?

#include <stdio.h>
#include <string.h>
int main()
{
char str[50]="IncludeHelp";
printf("%d...%d",strlen(str),sizeof(str));
return 0;
}

50...50
11...50
11...11
50...11

Answer

Correct Answer - 2
11...50
strlen returns the number of characters, and sizeof(str) returns total occupied size by str.

11)以下程序的输出是什么？

50 ... 50
11 ... 50
11 ... 11
50 ... 11

回答

正确答案-2
11 ... 50
strlen返回字符数， sizeof(str)返回按str占用的总大小。

12) What will be the output of following program ?

#include <stdio.h>
int main()
{
char *str="IncludeHelp";
while(*str)
printf("%s\n",str++);
return 0;
}

IncludeHelp
IncludeHel
IncludeHe
..
I
IncludeHelp
ncludeHelp
cludeHelp
..
P
ERROR
IncludeHelp

Answer

Correct Answer - 2

12)以下程序的输出是什么？

#include <stdio.h>
int main()
{
char *str="IncludeHelp";
while(*str)
printf("%s\n",str++);
return 0;
}

包括帮助
包括Hel
包括他
..
一世
包括帮助
nclude帮助
cludeHelp
..
P
错误
包括帮助

回答

正确答案-2

13) What will be the output of following program ?

#include <stdio.h>
#define string char*
int main()
{
string myName="IncludeHelp";
printf("My name is =%s",myName);
return 0;
}

IncludeHelp
Error
char*
myName

Answer

Correct Answer - 1
IncludeHelp
string will be replaced by char *.

13)以下程序的输出是什么？

包括帮助
错误
字符*
我的名字

回答

正确答案-1
包括帮助
字符串将被替换为char *。

14) What will be the output of following program ?

#include <stdio.h>
#include <string.h>
int main()
{
printf("%d...%d",sizeof("Hello"),strlen("Hello"));
return 0;
}

5...5
6...6
5...6
6...5

Answer

Correct Answer - 4
6...5
sizeof operator returns the size of the string including NULL character, and strlen returns the number of characters stored in string.

14)以下程序的输出是什么？

5 ... 5
6 ... 6
5 ... 6
6 ... 5

回答

正确答案-4
6 ... 5
sizeof运算符返回字符串的大小(包括NULL字符)，而strlen返回存储在字符串中的字符数。

15) What will be the output of following program ?

#include <stdio.h>
#include <string.h>
int main(){
char str[]="Ihelp";
while(str+strlen(str))
printf("*");
return 0;
}

ERROR
No output
***... infinite times
*

Answer

Correct Answer - 3
***... infinite times
str+strlen(str) in this expression str is a pointer that return memory address and str+strlen(str) = str+5, also an address (integer value), so expression str+strlen(str) will return non zero value.

15)以下程序的输出是什么？

错误
无输出
*** ...无限次
*

回答

正确答案-3
*** ...无限次
STR + strlen的(STR)在这个表达式str是一个指针返回存储器地址和STR + strlen的(STR)= STR + 5，也是一个地址(整数值)，所以表达STR +的strlen(STR)将返回非零值。