C language--operators, branching structures, looping structures

One, operator

Relational operators

Relational Operators	meaning	the expression in mathematics
<	Less than	<
<=	Less than or equal to	≤
>	Greater than	>
>=	Greater than or equal to	≥
==	Equals	=
!=	Not equal to	≠

Conditional operators

max = (a>b)? A:B;

　　

logical operators

operator	Description	Binding Nature	Example
&&	and arithmetic, binocular, corresponding to the "and" in mathematics	Left combination	1&&0, (9>3) && (b>a)
||	or arithmetic, binocular, corresponding to the "or" in mathematics	Left combination	1| | 0, (9>3) | | (B>a)
!	Non-arithmetic, monocular, corresponding to "non" in mathematics	Right combination	!a,! (2<5)

Two, branch structure

If Else

Non-bint in (Char *str) {char *str1= "a";p rintf ("strcmp (str, str1):%d\n", strcmp (str, str1)); if (strcmp (STR,STR1) ==0) { return 1;} else{    return 0;}}

Switch

Satisfies the case condition: there is a break that jumps out of the loop, and no break resumes execution of subsequent non-satisfied case conditions.

#include <stdio.h>int main () {    int A;    printf ("Input integer Number:");    scanf ("%d", &a);    Switch (a) {case        1:printf ("monday\n");        Case 2:printf ("tuesday\n"); break;        Case 3:printf ("wednesday\n"); break;        Case 4:printf ("thursday\n"); break;        Case 5:printf ("friday\n"); break;        Case 6:printf ("saturday\n");         Case 7:printf ("sunday\n");         default:printf ("error\n");     }    return 0;}

　

Third, the cycle structure

For

Break jumps out of the loop

　

int arr1 (int n,int arr[]) {for (int i=0;i<n;i++) printf ("%d", Arr[i]); return arr[i];}

　　

　　

C language--operators, branching structures, looping structures