24点 C语言程序

在网上找了个代码，我改了下，符合你的三个要求了。

#include<stdio.h>

double

fun(double

a1,double

a2,int

b)

{switch(b)

{case

0:return

(a1+a2)

case

1:return

(a1-a2)

case

2:return

(a1*a2)

case

3:return

(a1/a2)

}

}

void

main()

{int

i,j,k,l,n,m,r,save[4],flg=1

double

num[4]={1,1,1,1},tem1,tem2,tem3,abc=1111

char

sign[5]="+-*/"

printf("输入四个数:")

for(i=0i<4i++)

{scanf("%lf",num+i)

save[i]=num[i]if(save[i]>13)flg=0}

if(flg)

{

flg=0

for(i=0i<4i++)

for(j=0j<4j++)

if(j!=i)

{for(k=0k<4k++)

if(k!=i&&k!=j)

{for(l=0l<4l++)

if(l!=i&&l!=j&&l!=k)

{for(n=0n<4n++)

for(m=0m<4m++)

for(r=0r<4r++)

{tem1=fun(num[i],num[j],n)

tem2=fun(tem1,num[k],m)

tem3=fun(tem2,num[l],r)

if(tem3==24.0)

{printf("{(%d%c%d)%c%d}%c%d=24\n",save[i],sign[n],save[j],sign[m],save[k],sign[r],save[l])return}

else

if(tem3==-24.0)

{printf("{%d%c(%d%c%d)}%c%d=24\n",save[k],sign[m],save[i],sign[n],save[j],sign[r],save[l])return}

else

if(tem3==1.0/24.0)

{printf("%d%c{(%d%c%d)%c%d}=24\n",save[l],sign[r],save[i],sign[n],save[j],sign[m],save[k])return}

else

if(tem3==-1.0/24.0)

{printf("%d%c{%d%c(%d%c%d)}=24\n",save[l],sign[r],save[k],sign[n],save[i],sign[m],save[j])return}

else

{tem1=fun(num[i],num[j],n)

tem2=fun(num[k],num[l],r)

tem3=fun(tem1,tem2,m)

if(tem3==24.0)

{printf("(%d%c%d)%c(%d%c%d)=24\n",save[i],sign[n],save[j],sign[m],save[k],sign[r],save[l])return}

}

}

}

}

}

}

if(!flg)

printf("NO

ANSWER\n")

}

#include<stdio.h>

double fun(double a1,double a2,int b)

{switch(b)

{case 0:return (a1+a2)

case 1:return (a1-a2)

case 2:return (a1*a2)

case 3:return (a1/a2)

}

}

void main()

{int i,j,k,l,n,m,r,save[4]

double num[4]={1,1,1,1},tem1,tem2,tem3,abc=1111

char sign[5]="+-*/"

printf("input 4 numbers:")

for(i=0i<4i++)

{scanf("%lf",num+i)save[i]=num[i]}

for(i=0i<4i++)

for(j=0j<4j++)

if(j!=i)

{for(k=0k<4k++)

if(k!=i&&k!=j)

{for(l=0l<4l++)

if(l!=i&&l!=j&&l!=k)

{for(n=0n<4n++)

for(m=0m<4m++)

for(r=0r<4r++)

{tem1=fun(num[i],num[j],n)

tem2=fun(tem1,num[k],m)

tem3=fun(tem2,num[l],r)

if(tem3==24.0)printf("{(%d%c%d)%c%d}%c%d=24\n",save[i],sign[n],save[j],sign[m],save[k],sign[r],save[l])

else if(tem3==-24.0)printf("{%d%c(%d%c%d)}%c%d=24\n",save[k],sign[m],save[i],sign[n],save[j],sign[r],save[l])

else if(tem3==1.0/24.0)printf("%d%c{(%d%c%d)%c%d}=24\n",save[l],sign[r],save[i],sign[n],save[j],sign[m],save[k])

else if(tem3==-1.0/24.0)printf("%d%c{%d%c(%d%c%d)}=24\n",save[l],sign[r],save[k],sign[n],save[i],sign[m],save[j])

else

{tem1=fun(num[i],num[j],n)

tem2=fun(num[k],num[l],r)

tem3=fun(tem1,tem2,m)

if(tem3==24.0) printf("(%d%c%d)%c(%d%c%d)=24\n",save[i],sign[n],save[j],sign[m],save[k],sign[r],save[l])

}

}

}

}

}

}

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