iOS Learning Notes---C language the third day

Loop structure : While loop Do...while loop (almost unused) for loop (most used)

Characteristics: When a given condition is established, a program section is executed repeatedly until the condition is not established.

The given condition is a cyclic condition, which executes repeatedly in the program fragment loop body.

One, while loop

while (conditional expression) {

Loop statement;

}

#import <Foundation/Foundation.h>intMainintargcConst Char*argv[]) {    inti =0;  while(i<Ten) {printf ("hello,word!\n"); I++; }    return 0;}

1#import <Foundation/Foundation.h>2 3 intMainintargcConst Char*argv[])4 {5 //use while to print a multiple of 7 between 1~100. 6 //int i = 1,d;7 //While (i<=100) {8 //d = i%7;9 //if (d = = 0) {Ten //printf ("%d\t", I); One //        } A //         - //i++; - //    } the //use while to print the number of bits 7 between 1~100 - //int i = 1,d; - //While (i<=100) { - //d = i%10; + //if (d = = 7) { - //printf ("%d\t", I); + //        } A // at //i++; - //    } -     //use while to print out between 1~100? 10 bits of 7 - //int i = 1,d; - //While (i<=100) { - //d = I/10; in //if (d = = 7) { - //printf ("%d\t", I); to //        } + //         - //i++; the //    } *     //use while to print a multiple of 1~100 that is not 7 and does not contain a number of 7 $     inti =1, d,a,b;Panax Notoginseng      while(i<= -) { -D = i/Ten; theA = i%7; +b = i%Ten; A         if(d! =7&&a!=0&&b!=7) { theprintf"%d\t", i); +         } -          $i++; $     } -  -     return 0; the}

random number arc4random ()-----Returns a pseudo-random number

?

1 2	//得到0到30之间的数    printf("%d",arc4random()%31);

// get a number between ten to

printf("%d",arc4random()%+10 );

Fetch (M,N) between the random number printf ("%d", Arc4random ()% (n-m+1) +m);

1    //The user outputs from the console a N,? Use while to print n random numbers with a range of [30~70] to find the most significant value in n random numbers2#import <Foundation/Foundation.h>3 4 intMainintargcConst Char*argv[])5 {6     intn,i,max=0, B;7printf"Enter a number n:");8scanf"%d",&n);9      while(i<N) {Tenb = arc4random ()% A+ -; Oneprintf"%d", b); A         if(Max <b) { -Max =b; -         } thei++; -          -          -     } +printf"\nmax=%d", max); -     return 0; +}