C Language - Input/Output Questions and Answers

In a file contains the line "I am a boy\r\n" then on reading this line into the array str using fgets(). What will str contain?

What is the purpose of "rb" in fopen() function used below in the code? FILE *fp; fp = fopen("source.txt", "rb");

What does fp point to in the program ? #include<stdio.h> int main() {     FILE *fp;     fp=fopen("trial", "r");     return 0; }

Which of the following operations can be performed on the file "NOTES.TXT" using the below code? FILE *fp; fp = fopen("NOTES.TXT", "r+");

To print out a and b given below, which of the following printf() statement will you use? #include<stdio.h> float a=3.14; double b=3.14;

Which files will get closed through the fclose() in the following program? #include<stdio.h> int main() {     FILE *fs, *ft, *fp;     fp = fopen("A.C", "r");     fs = fopen("B.C", "r");     ft = fopen("C.C", "r");     fclose(fp, fs, ft);     return 0; }

On executing the below program what will be the contents of 'target.txt' file if the source file contains a line "To err is human"? #include<stdio.h> int main() {     int i, fss;     char ch, source[20] = "source.txt", target[20]="target.txt", t;     FILE *fs, *ft;     fs = fopen(source, "r");     ft = fopen(target, "w");     while(1)     {         ch=getc(fs);         if(ch==EOF)             break;         else         {             fseek(fs, 4L, SEEK_CUR);             fputc(ch, ft);         }     }     return 0; }

To scan a and b given below, which of the following scanf() statement will you use? #include<stdio.h> float a; double b;

Out of fgets() and gets() which function is safe to use?

Consider the following program and what will be content of t? #include<stdio.h> int main() {     FILE *fp;     int t;     fp = fopen("DUMMY.C", "w");     t = fileno(fp);     printf("%d\n", t);     return 0; }