題目：一個偶數總能表示為兩個素數之和。
1.程序分析：
2.程序源代碼：
#include "stdio.h" #include "math.h" main() { int a,b,c,d; scanf("%d",&a); for(b=3;b<=a/2;b =2) { for(c=2;c<=sqrt(b);c ) if(b%c==0) break; if(c>sqrt(b)) d=a-b; else break; for(c=2;c<=sqrt(d);c ) if(d%c==0) break; if(c>sqrt(d)) printf("%d=%d %d\n",a,b,d); } }
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