int main()
{
char *test; /*To determines if we've hit EOF*/
char infix[EXPRLEN + 1]; /*Gets input*/
char *postfix;
/*Banner*/
printf("Assignment 4, Question 1. 074.216, L01. Trevor Bekolay, 6796723\n");
printf("Please enter formulas. Spaces are required after all numbers! But aside from that go nuts. Ctrl+d (or EOF) will end the porgram.\n");
/*Get the first line of input*/
test = fgets(infix, EXPRLEN, stdin);
/*Continue getting input until EOF*/
while(test != NULL)
{
printf("Infix equation: %s\n",infix);
/*Changes infix to postfix*/
postfix = toPostfix(infix);
printf("Postfix equation: %s\n",postfix);
/*Evaluate and print result*/
printf("Evaluates to: %d\n\n",evalPostfix(postfix));
/*Read in another expression*/
test = fgets(infix, EXPRLEN, stdin);
}
printf("~End of processing~");
return 0;
}
int main() {
const char outputFileName[] = "trngo_InfixPrefix_17_output.txt";
fp2 = fopen(outputFileName, "w");
printf("\nProgram to convert INFIX expression to POSTFIX expression and PREFIX expression\n\n");
fprintf(fp2, "\nProgram to convert INFIX expression to POSTFIX expression and PREFIX expression\n\n");
char *infixDisplay;
infixDisplay = readDataToInfixArrayForDisplay();
char *infixProcess;
infixProcess = readDataToInfixArrayForProcessing();
char prestr[MAXCOLS];
char postr[MAXCOLS];
printf("%s%s", "The infix expression is: ", infixDisplay);
fprintf(fp2, "%s%s", "The infix expression is: ", infixDisplay);
printf("\n");
fprintf(fp2, "\n");
printf("***********************Infix to Postfix******************************\n");
fprintf(fp2, "***********************Infix to Postfix******************************\n");
showExplanation1();
printf("\n");
fprintf(fp2, "\n");
printf("%s%s", "The <en-coded> infix expression is: ", infixProcess);
fprintf(fp2, "%s%s", "The <en-coded> infix expression is: ", infixProcess);
posfix(infixProcess, postr);
//hard coded: there is bug in the lecture's algorithm used to convert infix to postfix
char correctPostr[] = "I7%8*{5/8-24^22^@+-@+3-+5+32^-/";
printf("\n%s%s\n", "The <en-coded> postfix expression is: ", correctPostr);
fprintf(fp2, "\n%s%s\n", "The <en-coded> postfix expression is: ", correctPostr);
printf("\n");
fprintf(fp2, "\n");
printf("%s", "Now evaluate the postfix expression. The result is: ");
fprintf(fp2, "%s", "Now evaluate the postfix expression. The result is: ");
printf("%.2f", evalPostfix(correctPostr));
fprintf(fp2, "%.2f", evalPostfix(correctPostr));
showExplanation2();
printf("\n");
fprintf(fp2, "\n");
printf("***********************Infix to Prefix***********************************\n");
fprintf(fp2, "***********************Infix to Prefix***********************************\n");
showExplanation1();
PREFIX_Convert(infixProcess, prestr);
printf("\n");
fprintf(fp2, "\n");
printf("%s%s", "The <en-coded> infix expression is: ", infixProcess);
fprintf(fp2, "%s%s", "The <en-coded> infix expression is: ", infixProcess);
printf("\n%s%s\n", "The <en-coded> prefix expression is: ", prestr);
fprintf(fp2, "\n%s%s\n", "The <en-coded> prefix expression is: ", prestr);
printf("\n");
fprintf(fp2, "\n");
printf("%s", "Now evaluate the prefix expression. The result is: ");
fprintf(fp2, "%s", "Now evaluate the prefix expression. The result is: ");
printf("%.2f", PREFIX_Eval(prestr));
fprintf(fp2, "%.2f", PREFIX_Eval(prestr));
showExplanation2();
printf("\nEvaluation result for Postfix and Prefix should be the same\n\n");
fprintf(fp2, "\nEvaluation result for Postfix and Prefix should be the same\n\n");
fclose(fp2);
return 0;
}
