수다닷컴

#include stdio.h
#include stdlib.h
#include time.h

void main()
{
srand(time(NULL));
int card1, card2, card3, card4;
int csum1, csum2;

while(card2==card1 || card3==card1 || card4==card1 || card3==card2 ||
card4==card2 || card4==card3)
{

card1 = rand() % 20+1;
card2 = rand() % 20+1;
card3 = rand() % 20+1;
card4 = rand() % 20+1;

csum1 = card1 + card2;
csum2 = card3 + card4;

if (csum1=10)
csum1=csum1-10;
if (csum1=20)
csum1=csum1-20;
if (csum1=30)
csum1=csum1-30;
else csum1;
if (csum2=10)
csum2=csum2-10;
if (csum2=20)
csum2=csum2-20;
if (csum2=30)
csum2=csum2-30;
else csum2;}

printf(user%3d %3d \ncomputr%3d %3d \nuser:%3d computer:%3d\n, card1, card2, card3, card4, csum1, csum2);

}요기서 20이상일경우만 20이 빠져서 안나오는데..
그 이유좀 가르쳐주세요~~

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