使用c语言编写计算器软件

#include<stdio.h>
#include<math.h>
#include<malloc.h>
double jisuan(char a[])
{
int i=1,j,k,m,cnt=0,t1=0,t2=0,t3=0;
char nibo[50],zhan2[50]; double x,n,l,z=0,zhan3[50]; typedef struct
{
double d1;
int d2;
}dd;
typedef struct
{
dd data[50];
int top;
}zhan1;
zhan1 *shu;
shu=(zhan1 *)malloc(sizeof(zhan1)); shu->top=0;
while(a[i]!='\0')
{
if(a[i]>='0'&&a[i]<='9')
{
z=0;
j=i+1;
while(a[j]>='0'&&a[j]<='9')
{j++;}
j--;
for(k=i;k<=j;k++)
{
z=z*10+a[k]-'0';
}
j=j+1;
x=z;
if(a[j]=='.')
{
l=1;
i=j+1;
j=i+1;
while(a[j]>='0'&&a[j]<='9')
{j++;}
j--;
for(k=i;k<=j;k++)
{
n=pow(0.1,l);
l=l+1;
x=x+n*(a[k]-'0');
}
i=j+1;
}
else i=j;
shu->data[++shu->top].d1=x;
shu->data[shu->top].d2=++cnt;
nibo[++t1]='0'+shu->data[shu->top].d2; nibo[t1+1]='\0';
}
else if(a[i]=='(')
{
zhan2[++t2]=a[i];
i++;
}
else if(a[i]==')')
{
j=t2;
while(zhan2[j]!='(')
{
nibo[++t1]=zhan2[j];
nibo[t1+1]='\0';
j--;
}
t2=j-1;
i++;
}
else if(a[i]=='+')
{
while(t2>0&&zhan2[t2]!='(')
{
nibo[++t1]=zhan2[t2];
nibo[t1+1]='\0';
t2--;
}
zhan2[++t2]=a[i];
i++;
}
else if(a[i]=='-')
{
if(a[i-1]=='$')
{
a[0]='0';
i=0;
}
else if(a[i-1]=='(')
{
a[i-1]='0';
a[i-2]='(';
i=i-2;
t2--;
}
else
{
while(t2>0&&zhan2[t2]!='(')
{
nibo[++t1]=zhan2[t2];
nibo[t1+1]='\0';
t2--;
}
zhan2[++t2]=a[i];
i++;
}
}
else if(a[i]=='*'||a[i]=='/')
{
while(zhan2[t2]=='*'||zhan2[t2]=='/'||zhan2[t2]=='^'||zhan2[t2]=='#') {
nibo[++t1]=zhan2[t2];
nibo[t1+1]='\0';
t2--;
}
zhan2[++t2]=a[i];
i++;
}
else if(a[i]=='^'||a[i]=='#')
{
while(zhan2[t2]=='^'||zhan2[t2]=='#')
{
nibo[++t1]=zhan2[t2];
nibo[t1+1]='\0';
t2--;
}
zhan2[++t2]=a[i];
i++;
}
}
while(t2>0)
{
nibo[++t1]=zhan2[t2];
nibo[t1+1]='\0';
t2--;
}
j=1;t3=0;
while(j<=t1)
{
if(nibo[j]>='0'&&nibo[j]!='^'&&nibo[j]!='#')// {
for(i=1;i<=shu->top;i++)
{
if((int)(nibo[j]-'0')==shu->data[i].d2)
{
m=i;
break;
}
}
zhan3[++t3]=shu->data[m].d1;
}
else if(nibo[j]=='+')
{
zhan3[t3-1]=zhan3[t3-1]+zhan3[t3];
t3--;
}
else if(nibo[j]=='-')
{
zhan3[t3-1]=zhan3[t3-1]-zhan3[t3];
t3--;
}
else if(nibo[j]=='*')
{
zhan3[t3-1]=zhan3[t3-1]*zhan3[t3];
t3--;
}
else if(nibo[j]=='/')
{
zhan3[t3-1]=zhan3[t3-1]/zhan3[t3];
t3--;
}
else if(nibo[j]=='^')
{
zhan3[t3-1]=pow(zhan3[t3-1],zhan3[t3]);
t3--;
}
else if(nibo[j]=='#')
{
zhan3[t3]=sqrt(zhan3[t3]);
}
j++;
}
return zhan3[t3];
}
void main()
{
for(;;)
{
char x,a[50];
double jieguo;
int i=0;
a[0]='$';
printf("#表示开方，^表示乘方(支持负数)\n");
printf("请输入表达式,退出请输入q：\n\n");
scanf("%c",&x);
if(x=='q') break;
while(x!='\n')
{
a[++i]=x;
scanf("%c",&x);
}
a[i+1]='\0';
jieguo=jisuan(a);
printf("\n");
printf("结果为:%lf",jieguo);
printf("\n\n\n\n\n");
} }。