20中随机抽取三个数,进行”加减“运算,结果仍在1~20范围内,产生运算表达式（不要运算结果）、
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#include

#include

#include

int main() {

x05int a[20],i,ia,ib,ic;

x05srand((unsigned int)(time(NULL)));

x05for(i = 0;i < 20;i++) a[i] = (unsigned)rand() % 20;

x05for(i = 0;i < 10;i++) {

x05x05ia = (unsigned)rand() % 20;

x05x05ib = (unsigned)rand() % 20;

x05x05ic = (unsigned)rand() % 20;

x05x05if((ia + ib - ic < 20) (ia + ib - ic > 0))

x05x05x05printf("%2d + %2d - %2d = %2dn",ia,ib,ic,ia + ib - ic);

x05x05else i--;

x05}

x05printf("n");

x05return 0;

}

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