Control Structure
 

  1. Question: What will be output when you will execute following c code?
    #include<stdio.h>
void main(){
    unsigned char c=280;
    switch(c){
        printf("Start\t");
        case 280:printf("David Beckham\t");
        case 24: printf("Ronaldinho\t");
        default:  printf("Ronaldo\t");
        printf("End");
    }
}
    Choose all that apply:

    A
    Start David Beckham Ronaldinho Ronaldo End

    B
    Start David Beckham Ronaldinho Ronaldo

    C
    Start Ronaldinho Ronaldo End

    D
    Ronaldinho Ronaldo End

    E
    Compilation error

    Note: 280 is beyond the range of unsigned char. Its corresponding cyclic value is: 24 In c switch case statement program control always move from the case which satisfy the switch condition and end with either break keyword, terminating} or any null character which will come first.
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  2. Question: What will be output when you will execute following c code?
    #include<stdio.h>
#define TRUE 1
void main(){
    switch(TRUE){
        printf("cquestionbank.blogspot.com");
     }  
}
    Choose all that apply:

    A
    cquestionbank.blogspot.com

    B
    It will print nothing

    C
    Runtime error

    D
    Compilation error

    E
    None

    Note: In c it is possible a switch case statement without any case but it is meaning less.
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  3. Question: What will be output when you will execute following c code?
    #include<stdio.h>
void main(){
     static int i;
     int j=1;
     int arr[5]={1,2,3,4};
     switch(arr[j]){
        case 1: i++;break;
        case 2: i+=2;j=3;continue;
        case 3: i%=2;j=4;continue;
        default: --i;
     }
     printf("%d",i);  
}
    Choose all that apply:

    A
    0

    B
    1

    C
    2

    D
    Compilation error

    E
    None

    Note: We cannot use continue keyword in switch case. It is part loop.
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  4. Question: What will be output when you will execute following c code?
    #include<stdio.h>
void main(){
     static int i;
     int j;
     for(j=0;j<=5;j+=2)
     switch(j){
        case 1: i++;break;
        case 2: i+=2;
        case 4: i%=2;j=-1;continue;
        default: --i;continue;
     }
     printf("%d",i); 
}
    Choose all that apply:

    A
    0

    B
    1

    C
    2

    D
    Compilation error

    E
    None

    Note: In first iteration of for loop: j = 0 So, control will come to default, i = -1 Due to continue keyword program control will move to beginning of for loop In second iteration of for loop: j =2 So, control will come to case 2, i+=2 i = i+2 = -1 +2 =1 Then come to case 4, i%=2 i = i%2 = 1%2 = 1 j= -1 Due to continue keyword program control will move to beginning of for loop In third iteration of for loop: j = -1 +2 =1 So, control will come to case 1 i = 2 In the fourth iteration of for loop: j = 1+ 2 =3 So, control will come to default, so i = 1 In the fifth iteration of for loop: j = 3 + 2 =5 So, control will come to default, so i = 0 In the sixth iteration of for loop: j = 5 + 2 =7 Since loop condition is false. So control will come out of the for loop.
    1. Report

  5. Question: What will be output when you will execute following c code?
    #include<stdio.h>
void main(){
     int x=3;
     while(1){
        switch(x){
             case 5/2: x+=x+++x;
             case 3%4: x+=x---x;continue;
             case 3>=3: x+=!!!x;break;
             case 5&&0:x+=~~~x;continue;
             default: x+=-x--;
        }
        break;
     }
     printf("%d",x);   
}
    Choose all that apply:

    A
    3

    B
    -1

    C
    5

    D
    Compilation error

    E
    None

    Note: Not available
    1. Report

  6. Question: What will be output when you will execute following c code?
    #include<stdio.h>
void main(){
     char *str="cquestionbank.blogspot.com";
     int a=2;
     switch('A'){
        case 97:
             switch(97){
                 default: str+=1;
             }
        case 65:
             switch(97){
                 case 'A':str+=2;
                     case 'a':str+=4;
         }
        default:
         for(;a;a--)
             str+=8;
     }
     printf("%s",str); 
}
    Choose all that apply:

    A
    cquestionbank.blogspot.com

    B
    blogspot.com

    C
    com

    D
    Compilation error

    E
    None

    Note: ASCII value of the character constant 'A' is 65 and 'a' is 97. Nesting of switch case is possible in c.
    1. Report

  7. Question: What will be output when you will execute following c code?
    #include<stdio.h>
void main(){
     switch(2){
        case 1L:printf("No");
        case 2L:printf("%s","I");
             goto Love;
        case 3L:printf("Please");
        case 4L:Love:printf("Hi");
     } 
}
    Choose all that apply:

    A
    I

    B
    IPleaseHi

    C
    IHi

    D
    Compilation error

    E
    None

    Note: It is possible to write label of goto statement in the case of switch case statement.
    1. Report

  8. Question: What will be output when you will execute following c code?
    #include<stdio.h>
void main(){
     int a=5;
     a=a>=4;
     switch(2){
        case 0:int a=8;
        case 1:int a=10;
        case 2:++a;
        case 3:printf("%d",a);
     }
}
    Choose all that apply:

    A
    8

    B
    11

    C
    10

    D
    Compilation error

    E
    None

    Note: We can not declare any variable in any case of switch case statement.
    1. Report

  9. Question: What will be output when you will execute following c code?
    #include<stdio.h>
void main(){
     int a=3,b=2;
     a=a==b==0;
     switch(1){
        a=a+10;
     }
     sizeof(a++);
     printf("%d",a); 
}
    Choose all that apply:

    A
    10

    B
    11

    C
    13

    D
    1

    E
    Compilation error

    Note: Consider on the expression: a=a==b==0; a=(a==b)==0; //Since associate is right to left a =(3==2)==0 a=0==0 a=1 switch case will not affect the value of variable a. Also sizeof operator doesn't affect the value of the any variable
    1. Report
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