C语言带小数加减乘除.doc

/*Desgined by doBell-ConG*/*Function:simply add, subtract, multiply and divide*/#include char Array50;/字符数组double Num20;/双精度数组char Symbol10;/符号数组int arrayCount;/字符数组计数器int numCount;/双精度数组计数器int symbolCount;/符号数组计数器int loopFlag;/循环标记计数器void transform();/转换函数,用于把字符串分离成两个数组，一个是待计算数的双精度数组，另一个是运算符号的数组。double Calculate();/计算函数，使用两个数组计算出最终结果。void Format();/初始化全局变量。void main() Format(); while(gets(Array)&Array!=EOF)/该循环用以重复使用程序。 transform(); printf(The result = %gnn,Calculate(); Format(); void Format() memset(Array,0,sizeof(Array);/清空全局数组 memset(Num,0,sizeof(Num); memset(Symbol,0,sizeof(Symbol); arrayCount = 0; numCount = 0; symbolCount = 0; loopFlag = 0; system(PAUSE); /系统暂停语句。 system(CLS); /系统清屏语句。 printf(Please input a string ending of = to be calculated:n);void transform() int pointFlag = 0;/精度标识，0表示小数点前的累加计算，1表示小数点后的累加计算 int pointBit = 1; /小数点位数，1表示小数点后1位，2表示小数点后两位，依次类推。 double tempPointValue = 0;/小数点后累加临时存放值 double tempNum = 0;/数值转换临时存放值 while(ArrayarrayCount != 0) /扫描字符数组，进行相应处理。 if(ArrayarrayCount=+|ArrayarrayCount=-|ArrayarrayCount=* |ArrayarrayCount= /|ArrayarrayCount= =) NumnumCount = tempNum; /如果遇到运算符，前面的数转换完成输入数组。 tempNum = 0; pointBit = 1; pointFlag = 0; numCount +; SymbolsymbolCount = ArrayarrayCount; arrayCount+; symbolCount+; continue; else if (ArrayarrayCount = .)/如果遇到小数点，转换数字累加方式。 if(pointFlag = 0) pointFlag = 1; else pointFlag =0; arrayCount+; continue; else /如果其他，即为数字，分为以下两种情况： if(pointFlag = 0) /1、小数点前的累加 tempNum = tempNum*10 + (double)(ArrayarrayCount-48); arrayCount+; else if(pointFlag = 1) /2、小数点后的累加 tempPointValue = (double)(ArrayarrayCount-48); for( loopFlag = 0; loopFlagpointBit; loopFlag+) tempPointValue = tempPointValue *0.1; tempNum = tempNum + tempPointValue; arrayCount+; pointBit+; continue; double Calculate() symbolCount = 0; while(SymbolsymbolCount!=0) /该while循环在前，扫描符号数组用以计算乘除。 if(SymbolsymbolCount=*) NumsymbolCount=NumsymbolCount*NumsymbolCount+1; for(loopFlag = symbolCount; loopFlag(numCount-1); loopFlag+) NumloopFlag+1 = NumloopFlag+2; for(loopFlag = symbolCount; SymbolloopFlag!=0; loopFlag+) SymbolloopFlag = SymbolloopFlag+1; symbolCount-; numCount-; else if(SymbolsymbolCount=/) NumsymbolCount=NumsymbolCount/NumsymbolCount+1; for(loopFlag = symbolCount; loopFlag(numCount-1); loopFlag+) NumloopFlag+1 = NumloopFlag+2; for(loopFlag = symbolCount; SymbolloopFlag!=0; loopFlag+) SymbolloopFlag = SymbolloopFlag+1; symbolCount-; numCount-; symbolCount+; continue; symbolCount = 0; while(SymbolsymbolCount!=0) /该while循环用以计算加减。 if(SymbolsymbolCo