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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int main(void) 
  5. {
  6.     int number = 0;
  7.     int *prime = malloc(1000*sizeof(int));
  8.     unsigned long counter = 0;
  9.     int ptr = 0;
  10.  
  11.     prime[ptr] = 2;
  12.     ptr++;
  13.     prime[ptr] = 3;
  14.     ptr++;
  15.  
  16.     for (int number = 5; number <= 1000; number +=2){
  17.     	for (int i = 1; i <= ptr; i++){//課本範例是i < ptr  如果不寫=的話迴圈會掛掉
  18.     		counter++;
  19.     		if ((number % prime[i]) == 0)
  20.     			break;
  21.     	   	if (ptr == i){
  22.     		prime[ptr++] = number;
  23.     	    	break;					//這應該已經是迴圈終點了可是這break不能省
  24.     }
  25.     }
  26.     }
  27.     for (int i = 0; i < ptr; i++)
  28.         printf("%d\n", prime[i]);
  29.     printf("the program run %d times\n", counter);
  30.       free(prime);
  31.       return 0;
  32. }
Runtime error #stdin #stdout 0s 2296KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/c4b2tF
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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