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%{ #include <stdio.h> #include <stdlib.h> int result = 0; int temp; char op = '+'; %} %% [0-9]+ { temp = atoi(yytext); switch(op) { case '+': result += temp; break; case '-': result -= temp; break; case '*': result *= temp; break; case '/': result /= temp; break; } } [\+\-\*/] { op = yytext[0]; } [ \t\n] { /* Ignore whitespace */ } . { printf("Invalid character: %s\n", yytext); } %% int main() { printf("Enter arithmetic expression: "); yylex(); printf("Result: %d\n", result); return 0; }
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