C Tutorial/Statement/While Loop
Содержание
Between a while loop and a for loop
<source lang="cpp">for(A;B;C){
printf("%d\t",i);
} It becomes
A; while(B) {
printf("%d\t",i);
C;
}</source>
Put function into while loop condition statement
<source lang="cpp">#include <stdio.h>
int main() {
puts("Start typing.");
puts("Press ~ then Enter to stop");
while(getchar() != "~")
;
printf("Thanks!\n");
return(0);
}</source>
Start typing.
Press ~ then Enter to stop
a
a
a
a
a
a~
Thanks!
The while loop
The general format for a while loop is
<source lang="cpp">while (condition) {
simple or compound statement (body of the loop); }</source>
While loop and sum integers
<source lang="cpp">#include <stdio.h> int main(void) {
long sum = 0L;
int i = 1;
int count = 0;
printf("\nEnter the number of integers you want to sum: ");
scanf(" %d", &count);
while(i <= count){
sum += i++;
}
printf("Total of the first %d numbers is %ld\n", count, sum);
return 0;
}</source>
Enter the number of integers you want to sum: 1
Total of the first 1 numbers is 1
while loop nested in a for loop
<source lang="cpp">#include <stdio.h> int main(void) {
long sum = 1L;
int j = 1;
int count = 10;
int i;
for(i = 1 ; i <= count ; i++)
{
sum = 1L;
j=1;
printf("\n1");
while(j < i){
sum += ++j;
printf("+%d", j);
}
printf(" = %ld\n", sum);
}
return 0;
}</source>
1 = 1
1+2 = 3
1+2+3 = 6
1+2+3+4 = 10
1+2+3+4+5 = 15
1+2+3+4+5+6 = 21
1+2+3+4+5+6+7 = 28
1+2+3+4+5+6+7+8 = 36
1+2+3+4+5+6+7+8+9 = 45
1+2+3+4+5+6+7+8+9+10 = 55
