7th Day of Learning C

#include <stdio.h>

int main ()

{

int x=0;

if (x==0)

{

printf ("x is false \ n");

}

Else

{

printf ("x is true \ n");

}

return 0;

}

if (x==0) can also be written as if (!x), because The value of x is 0 is false, so !x is true, The computer can only recognize the values of 0 and 1 , which is difficult to understand, not recommended, good programmers write code is easy to understand

#include <stdio.h>

int main ()

{

int x, y;

printf (" Enter an integer:");

scanf ("%d", &x);

Y= (x<0)-x:x;

printf (" the absolute value of this number is:%d\n", y);

return 0;

}

Y= (x<0)-x:x; the right side of the expression is a conditional expression with three operands, respectively. And: separated, so? : This is called the trinocular operator, and when the x<0 is true, the value of - x is taken ( Absolute ), Take The value of x when it is false

#include <stdio.h>

int main ()

{

int x=1,y=2,z;

z=x>y?x:x>y?x:y;

printf ("z:%d\n", z);

return 0;

}

The order of the Trinocular operators is executed from right to left

#include <stdio.h>

int main ()

{

int a=1,b=2;

printf ("%d\n", (a>b) a:b);

return 0;

}

The above is a flexible application of a three-mesh operator

#include <stdio.h>

int main ()

{

int a=1;

float b=2.1f;

printf ("%f\n", a>b?a:b);

return 0;

}

The trinocular operator can manipulate not only integers, but also floating-point numbers

#include <stdio.h>

int main ()

{

Char A;

scanf ("%c", &a);

printf ("%c\n", a= (a>= ' a ' &&a<= ' Z ')? ( A+32): a);

return 0;

}

(a>= ' A ' &&a<= ' Z ') Judging a whether the value of this variable is in uppercase A- z between, (a+32) means to convert lowercase into larger

7th Day of Learning C