CodePudding user response:

 
#include  
#include  
#include  

Int main () 
{
Double m; 
int c; 
Printf (" input a real number: \ n "); 
Lf the scanf (" % ", & amp; M); 

While (1) 
{
Printf (" * * * * * * * * * * * * * * * * * * * * \ n "); 
Printf (" 1. Output opposite \ n "); 
Printf (" output square number 2. \ n "); 
Printf (" 3. Output square root \ n "); 
Printf (" exit 4. \ n "); 
Printf (" * * * * * * * * * * * * * * * * * * * * \ n "); 
Printf (" input options: "); 
The scanf (" % d ", & amp; c); 
The switch (c) 
{
Case 1: 
Printf (" % 2 f opposite is: % 2 f \ n ", m, -m); 
break; 
Case 2: 
Printf (" % 2 f square number is:. % 2 f \ n ", m, m * m); 
break; 
Case 3: 
Printf (" %. What's the square root of 2 f: % 2 f \ n ", m, SQRT (m)); 
break; 
Case 4: 
Printf (" exit the program! \n"); 
exit(0); 
break; 
Default: 
Printf (" please enter a number between 1-4! \n"); 
break; 
} 
} 

system("pause"); 
return 0; 
} 

CodePudding user response:

 
#include  
#include  

Int main (void) 
{
int i; 
Float m; 
Int c=5; 
Printf (" input a real number: \ n "); 
The scanf (" % f ", & amp; M); 
Printf (" * * * * * * * * * * * * * * * * * * * * * \ n "); 
Printf (" 1. Input the opposite \ n "); 
Printf (" output square number 2. \ n "); 
Printf (" 3. Output square root \ n "); 
Printf (" exit 4. \ n "); 
Printf (" * * * * * * * * * * * * * * * * * * * * * \ n "); 
While (I & lt; {
=4)The scanf (" % d ", & amp; c); 
The switch (c) {
Case 1: 
Printf (" output opposite: % 2 f \ n ", -m); 
break; 
Case 2: 
Printf (" output square number: % 2 f \ n ", m * m); 
break; 
Case 3: 
Printf (" output square root: % 2 f \ n ", SQRT (m)); 
break; 
Case 4: 
Printf (" exit the program! \n"); 
break; 
Default: 
Printf (" please enter a number between 1 ~ 4! \n"); 
} 
If (c==4) {
break; 
} 
} 
return 0; 
} 

CodePudding user response:

 printf (" %. What's the square root of 2 f: % 2 f \ n ", m, (m<0? 0: SQRT (m)));