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#include

#include

#include

void?main()

{

int?n,i,m,time1=0;long?answer1,answer;float?a[10];?char?c[2],str[10];

long?result(float?a[],char?str[],int?n);

begin:

time1=0;

srand(time(NULL));

n=(rand()%10)+3;

if(n/2)

n=n+1;

for(i=0;i

a[i]=rand()%300+1;

for(i=0;i

{

m=rand()%4;

switch(m)

{

case?0:str[i]='+';break;

case?1:str[i]='-';break;

case?2:str[i]='*';break;

case?3:str[i]='/';break;

}

}

printf("this?is?a?text?please?show?right?answer\nyou?have?3?times\nGOOD?LUCK\n");

for(i=0;i

printf("%.2f%c",a[i],str[i]);

printf("%.2f",a[(n+1)/2-1]);

printf("\n");

printf("input?your?answer\n");

answer=result(a,str,n);

do

{

scanf("%ld",&answer1);

getchar();

time1++;

}while(answer1!=answer&&time1<=3);

if(answer==answer1)

printf("you?are?right\n");

if(answer!=answer1)

printf("sorry?the?right?answer?is?%ld\n",answer);

printf("try?again?Y/N\n");

scanf("%s",c);

if(c[0]=='y'||c[0]=='Y')

goto?begin;

}

long?result(float?a[],char?str[],int?n)

{

int?i,j,a1,b;

a1=(n-1)/2;

b=(n+1)/2;

for(i=0;i

{

if(str[i]=='*')

{

a[i]=a[i]*a[i+1];

a1--;b--;

for(j=i;j

str[j]=str[j+1];

for(j=i+1;j

a[j]=a[j+1];

i--;

}

if(str[i]=='/')

{

a[i]=a[i]/a[i+1];

a1--;b--;

for(j=i;j

str[j]=str[j+1];

for(j=i+1;j

a[j]=a[j+1];

i--;

}

}

for(i=0;i

{

if(str[i]=='+')

{

a[i]=a[i]+a[i+1];

a1--;b--;

for(j=i;j

str[j]=str[j+1];

for(j=i+1;j

a[j]=a[j+1];

i--;

}

if(str[i]=='-')

{

a[i]=a[i]-a[i+1];

a1--;b--;

for(j=i;j

str[j]=str[j+1];

for(j=i+1;j

a[j]=a[j+1];

i--;

}

}

return((long)a[0]);

}

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