In LINUX

IF ex.1c is

#include

void main(){

printf("hello ");

}

gcc -o ex1 ex1.c

The compiler has translated the C statements in ex1.c into machine instructions and stored in ex1(the executable file):

55 -- push rbp

48 89 e5 -- mov rbp, rsp

bf f0 05 40 00 - mov edi, 0x400df0

.........

Find these machine instructions in ex1 with xxd. Use "/pattern" command in vi to search for a string.

2. Write a program to read a sentence and echo it as follows. Use gets() or fgets(). Do "man gets" or "man fgets" to find out the usage of them.

Enter a sentence

aa bcd e e ff aa bcd bcd hijk lmn al bcd

You entered aa bcd e e ff aa bcd bcd hijk lmn al bcd