#include <stdio.h>
void print_date (const int a,const int b) {
printf("n = %d , m = %d",a,b);
}
int pailie (int a,int b) {
int tmp = 1;
for (b-=1;0!=(b+1);b--) {
tmp*=(a-b);
}
return tmp;
}
int zuhe (int a,int b) {
int tmp,c,d,e;
c=b;
for (c-=1;(c+1)!=0;c--) {
d*=(a-c);
}
c=b;
for (c-=1;(c+1)!=0;c--) {
e*=(b-c);
}
tmp = d/e;
return tmp;
}
int main (void) {
int x,y,i,tmp,choose;
printf("输入两个数字\n");
printf("第一个数字=");
scanf("%d",&x);
printf("第二个数字=");
scanf("%d",&y);
if (y>x){
i=x;
x=y;
y=i;
}
do {
printf("\n计算m A n输入1，计算m C n输入2 :");
scanf("%d",&choose);
} while (choose>2);
print_date (x,y);
switch (choose) {
case 1:
tmp = pailie (x,y);
printf("\n n A m =%d\n",tmp);
break;
case 2:
tmp = zuhe (x,y);
printf("\n n C m =%d\n",tmp);
break;
}
scanf("%d",&i);
return 0;
} |
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