C语言实现运算器的原理 完整编程代码.zip

#include"data.h" /*the maximum length is Max-2(include '\0' and '#'*/ int Input(char *exp) { int len; printf("input the expressio:\n"); scanf("%s",exp); len=strlen(exp); if(len+1>=Max){ printf("the expression is too long\n"); return 0; } if(exp[0]=='#') return 0; else { exp[len]='#'; exp[len+1]='\0'; return 1; } } int Prefer(char opnr1,char exp[],int i) { if(opnr1=='+'||opnr1=='-') { switch(exp[i]){ case '+': case '-': case ')': case '#':return High; case '*': case '/': case '^': case '(':return Low; case '|': if(exp[i-1]=='|'||exp[i-1]==')'||exp[i-1]>=48&&exp[i-1]<=57) return High; else return Low; break; } } else if(opnr1=='*'||opnr1=='/') { switch(exp[i]) { case '(': case '^': return Low; case '|': if(exp[i-1]>=48&&exp[i-1]<=57||exp[i-1]=='|'||exp[i-1]==')') return High; else return Low; break; default:return High; } } else if(opnr1==')'){ switch(exp[i]) { case '(':return Error; default:return High; } } else if(opnr1=='(') { switch(exp[i]) { case ')':return Equal; default:return Low; } } else if(opnr1=='|') { switch(exp[i]) { case ')': case '#': case '^': case '|': return High; default :return Low; } } else if(opnr1=='^') { switch(exp[i]) { case '(': case ')': case '^':return Low; default:return High; } } else if(exp[i]=='#') return Equal; else return Low; } double Count(double a,double b,int c) { double result; switch(c) { case '+':result=a+b; break; case '-':result=a-b; break; case '*':result=a*b; break; case '/':result=a/b; break; case '|': result=fabs(b); break; case '^': result=pow(a,b); } return result; } /*tranfer the char to double number*/ double Transfer(int Real_len,int Decimal_len,char Real[],char Decimal[]) { int total; double sum=0; Real_len--; total=Real_len; for(;Real_len>=0;Real_len--) sum=sum+(Real[Real_len]-48)*pow(10,total-Real_len); if(Decimal_len>0) { Decimal_len--; for(;Decimal_len>=0;Decimal_len--) sum=sum+(Decimal[Decimal_len]-48)*pow(0.1,Decimal_len+1); } return sum; }