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C Programming :: Input / Output

Input / Output - General Questions
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Input / Output - Yes / No Questions
Input / Output - Find Output of Program
Input / Output - True / False Questions
Input / Output - Point Out Correct Statements

  1. What will be the content of 'file.c' after executing the following program?

    #include 

 int main() 
 {  
     FILE *fp1, *fp2;     
     fp1=fopen("file.c", "w");     
     fp2=fopen("file.c", "w");     
     fputc('A', fp1); 
     fputc('B', fp2);    
     fclose(fp1);    
     fclose(fp2);   
     return 0;
 }

     

    2. A.

    B
    B.

    A
    B
    C.

    B
    B
    D.

    Error in opening file 'file1.c'

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  2. What will be the output of the program ?

     #include

  int main()
  {     
       int k=1;  
       printf("%d == 1 is" "%s\n", k, k==1?"TRUE":"FALSE");     
       return 0; 
  }

    3. A.

    k == 1 is TRUE
    B.

    1 == 1 is TRUE
    C.

    1 == 1 is FALSE
    D.

    K == 1 is FALSE

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  3. What will be the output of the program ?

     #include
 char *str = "char *str = %c%s%c; main(){ printf(str, 34, str, 34);}";  

 int main()
 {    
     printf(str, 34, str, 34);     
     return 0;
 }

    4. A.

    char *str = "char *str = %c%s%c; main(){ printf(str, 34, str, 34);}"; main(){ printf(str, 34, str, 34);}
    B.

    char *str = %c%s%c; main(){ printf(str, 34, str, 34);}
    C.

    No output
    D.

    Error in program

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  4. If the file 'source.txt' contains a line "Be my friend" which of the following will be the output of below program?

    #include
  int main() 
  {   
      FILE *fs, *ft; 
      char c[10];   
      fs = fopen("source.txt", "r");     
      c[0] = getc(fs); 
      fseek(fs, 0, SEEK_END);     
      fseek(fs, -3L, SEEK_CUR);     
      fgets(c, 5, fs); 
      puts(c);   
      return 0; 
 }

    5. A.

    friend
    B.

    frien
    C.

    end
    D.

    Error in fseek();

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  5. What will be the output of the program ?

     #include 
 int main()
 {  
    float a=3.15529;        
    printf("%2.1f\n", a);  
    return 0; 
 }

    6. A.

    3.00
    B.

    3.15
    C.

    3.2
    D.

    3

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  6. What will be the output of the program ?

     #include

  int main() 
  {   
      printf("%c\n", ~('C'*-1));     
      return 0;
  }

    7. A.

    A
    B.

    B
    C.

    C
    D.

    D

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  7. What will be the output of the program ?

    #include 
 int main() 
 {   
      FILE *fp;  
      unsigned char ch;   
      /* file 'abc.c' contains "This is FresherGATE " */    
      fp=fopen("abc.c", "r");     
      if(fp == NULL)  
      {      
          printf("Unable to open file");      
         exit(1);    
 }     
 while((ch=getc(fp)) != EOF)         
     printf("%c", ch);      
     
   fclose(fp);   
   printf("\n", ch);   
   return 0; 
}

    8. A.

    This is fresherGATE
    B.

    This is
    C.

    Infinite loop
    D.

    Error

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  8. What will be the output of the program ?

    #include 

 int main()
 {
    char *p;  
    p="%d\n";    
    p++;    
    p++;     
    printf(p-2, 23);    
    return 0;
 }

    9. A.

    21
    B.

    23
    C.

    Error
    D.

    No output

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  9. What will be the output of the program ?

    #include 

 int main()
 {
     FILE *ptr;    
     char i;   
     ptr = fopen("myfile.c", "r");     
     while((i=fgetc(ptr))!=NULL)         
         printf("%c", i); 
     return 0; 
 }

    10. A.

    Print the contents of file "myfile.c"
    B.

    Print the contents of file "myfile.c" upto NULL character
    C.

    Infinite loop
    D.

    Error in program

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  10. What will be the output of the program ?

     #include 

 int main()
 {     
    printf("%%%%\n");  
    return 0; 
 }

    11. A.

    %%%%%
    B.

    %%
    C.

    No output
    D.

    Error

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