pta Exercise 5-1 Symbolic function (10 points)

Topic Collection of Zhejiang University Edition "C Language Programming (3rd Edition)"

Exercise 5-1 Symbolic function (10 points)

This question requires the realization of the sign function sign(x).

Function interface definition:

int sign( int x );

Among them xis the integer parameter passed in by the user. The sign function is defined as: if xgreater than 0, sign(x)= 1; if xequal to 0, sign(x)= 0; otherwise, sign(x)= −1.
Sample referee test procedure:

#include <stdio.h>

int sign( int x );

int main()
{
    
    
    int x;

    scanf("%d", &x);
    printf("sign(%d) = %d\n", x, sign(x));

    return 0;
}

/* 你的代码将被嵌在这里 */

Input sample:

10

Sample output:

sign(10) = 1

Code implementation 1:

int sign (int x)
{
    
    
	int a;
	if(x>0){
    
    
		a=1;
	}else if(x==0){
    
    
		a=0;
	}else{
    
    
		a=-1;
	}
	return a;
}

Code implementation 2:

int sign( int x ){
    
    
int flag=0;
flag = (x==0) ? 0 : ((x>0) ? 1 : -1);
return flag;
}

Submit result:

to sum up:

The ternary operator provides a shorthand way of expressing simple if-else statements. Familiar with the ternary operator and use it to reduce the amount of code and make it simple and easy to understand.