编译技术课程设计报告-词法分析、语法分析、中间代码生成

{

words[j++] = ch; words[j] = '\\0'; flag = 9; }

else if (ch == '+') {

words[j++] = ch; words[j] = '\\0'; flag = 9; } else { i--; flag = 9; } break; }

case'-':{ if (ch == '-') words[j++] = ch; words[j] = '\\0'; ch = program[i++]; if (ch == '=') {

words[j++] = ch; words[j] = '\\0'; flag = 12; }

else if( ch == '-') {

words[j++] = ch; words[j] = '\\0'; flag = 12; } else { i--; flag = 12; } break; }

第20页

case'*':{ if (ch == '*') words[j++] = ch; words[j] = '\\0'; ch = program[i++]; if (ch == '*') {

words[j++] = ch; words[j] = '\\0'; flag = 11; } else { i--; flag = 10; } break; }

case'/':{ if (ch == '/') words[j++] = ch; words[j] = '\\0'; ch = program[i++]; if (ch == '=') {

words[j++] = ch; words[j] = '\\0'; flag = 13; } else { i--; flag = 13; } break; }

case';':{ words[j] = ch; words[j+1] = '\\0'; flag = 15; break; }

第21页

case'(':{ words[j] = ch; words[j+1] = '\\0'; flag = 17; break; }

case')':{ words[j] = ch; words[j+1] = '\\0'; flag = 17; break; }

case'[':{ words[j] = ch; words[j+1] = '\\0'; flag = 21; break; }

case']':{ words[j] = ch; words[j+1] = '\\0'; flag = 21; break; }

case'{':{ words[j] = ch; words[j+1] = '\\0'; flag = 20; break; }

case'}':{ words[j] = ch; words[j+1] = '\\0'; flag = 20; break; }

case':':{

第22页

words[j] = ch; words[j+1] = '\\0'; flag = 22; break; }

case',':{ words[j] = ch; words[j+1] = '\\0'; flag = 16; break; }

case'#':{ words[j] = ch; words[j+1] = '\\0'; flag = 0; break; }

case' '://空格 {

words[j] ='_'; words[j+1] = '\\0'; flag = 24; break; }

//case'$':{ //words[j] = '#'; //words[j+1] = '\\0'; //flag = 0; //break; //}

default:{ flag = -1; break; } }

return flag; }

第23页