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  • Question
  • What will be the output of the program?
    #include<stdio.h>
    #include<string.h>
    
    int main()
    {
        char str1[20] = "Hello", str2[20] = " World";
        printf("%s\n", strcpy(str2, strcat(str1, str2)));
        return 0;
    }
    


  • Options
  • A. Hello
  • B. World
  • C. Hello World
  • D. WorldHello

  • Correct Answer
  • Hello World 

    Explanation
    Step 1: char str1[20] = "Hello", str2[20] = " World"; The variable str1 and str2 is declared as an array of characters and initialized with value "Hello" and " World" respectively.

    Step 2: printf("%s\n", strcpy(str2, strcat(str1, str2)));

    => strcat(str1, str2)) it append the string str2 to str1. The result will be stored in str1. Therefore str1 contains "Hello World".

    => strcpy(str2, "Hello World") it copies the "Hello World" to the variable str2.

    Hence it prints "Hello World".


    More questions

    • 1. What will be the output of the program?
      #include<stdio.h>
      int main()
      {
          int x=4, y, z;
          y = --x;
          z = x--;
          printf("%d, %d, %d\n", x, y, z);
          return 0;
      }
      

    • Options
    • A. 4, 3, 3
    • B. 4, 3, 2
    • C. 3, 3, 2
    • D. 2, 3, 3
    • Discuss
    • 2. Functions cannot return a floating point number

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 3. What will be the output of the program?
      #include<stdio.h>
      int main()
      {
          int a=100, b=200, c;
          c = (a == 100 || b > 200);
          printf("c=%d\n", c);
          return 0;
      }
      

    • Options
    • A. c=100
    • B. c=200
    • C. c=1
    • D. c=300
    • Discuss
    • 4. What will be the output of the program?
      #include<stdio.h>
      int main()
      {
          int x=55;
          printf("%d, %d, %d\n", x<=55, x=40, x>=10);
          return 0;
      }
      

    • Options
    • A. 1, 40, 1
    • B. 1, 55, 1
    • C. 1, 55, 0
    • D. 1, 1, 1
    • Discuss
    • 5. What will be the output of the program?
      #include<stdio.h>
      
      int main()
      {
          void fun(char*);
          char a[100];
          a[0] = 'A'; a[1] = 'B';
          a[2] = 'C'; a[3] = 'D';
          fun(&a[0]);
          return 0;
      }
      void fun(char *a)
      {
          a++;
          printf("%c", *a);
          a++;
          printf("%c", *a);
      }
      

    • Options
    • A. AB
    • B. BC
    • C. CD
    • D. No output
    • Discuss
    • 6. Which of the following statements correct about k used in the below statement?
      char ****k;

    • Options
    • A. k is a pointer to a pointer to a pointer to a char
    • B. k is a pointer to a pointer to a pointer to a pointer to a char
    • C. k is a pointer to a char pointer
    • D. k is a pointer to a pointer to a char
    • Discuss
    • 7. What will be the output of the program?
      #include<stdio.h>
      
      void fun(void *p);
      int i;
      
      int main()
      {
          void *vptr;
          vptr = &i;
          fun(vptr);
          return 0;
      }
      void fun(void *p)
      {
          int **q;
          q = (int**)&p;
          printf("%d\n", **q);
      }
      

    • Options
    • A. Error: cannot convert from void** to int**
    • B. Garbage value
    • C. 0
    • D. No output
    • Discuss
    • 8. What will be the output of the program?
      #include<stdio.h>
      #include<string.h>
      
      int main()
      {
          static char s[] = "Hello!";
          printf("%d\n", *(s+strlen(s)));
          return 0;
      }
      

    • Options
    • A. 8
    • B. 0
    • C. 16
    • D. Error
    • Discuss
    • 9. What will be the output of the program?
      #include<stdio.h>
      
      int main()
      {
          int i=4, j=8;
          printf("%d, %d, %d\n", i|j&j|i, i|j&&j|i, i^j);
          return 0;
      }
      

    • Options
    • A. 4, 8, 0
    • B. 1, 2, 1
    • C. 12, 1, 12
    • D. 0, 0, 0
    • Discuss
    • 10. What will you do to treat the constant 3.14 as a float?

    • Options
    • A. use float(3.14f)
    • B. use 3.14f
    • C. use f(3.14)
    • D. use (f)(3.14)
    • Discuss


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