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<blockquote data-quote="symantec11_76" data-source="post: 767429" data-attributes="member: 46287">I wrote a program that should work just fine.&nbsp; I compiled the same program on a Windows compiler and the program works great.&nbsp; However, my GCC compiler seems to be having a problem with the character type scanf within an if statement which is also within a do while loop.&nbsp; My default GCC version is 4.0.&nbsp; Anyone have any ideas.&nbsp; The program is below with a comment on which scanf is causing the problem.&nbsp; When the program gets to that scanf, it just continues on by without waiting for user input of y or n.#include &lt;stdio.h&gt;#include &lt;stdlib.h&gt;#include &lt;time.h&gt;//Library stdlib.h needed for srand.&nbsp; Library time.h needed for time randomization.main (){&nbsp; &nbsp; &nbsp; &nbsp; int iRandom=0,iGuess=0,iGuessMade=0;&nbsp; &nbsp; char cExit='\0';&nbsp; &nbsp; //Data type calls - iRandom is random value, iGuess is for users guess, iGuessMade to count guesses and cExit is for y or n to play again.&nbsp; &nbsp; &nbsp; &nbsp; srand(time(NULL));&nbsp; &nbsp; //srand call for rand to randomize each time&nbsp; &nbsp; &nbsp; &nbsp; iRandom = (rand() % 10)+1;&nbsp; &nbsp; //Randomize number between 0 and 999, then add 1 in order to assign values between 1 and 1000.&nbsp; &nbsp; //Randomize before first loop in order to keep same value until guessed right.&nbsp; &nbsp; &nbsp; &nbsp; do&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n\n***************************************&quot;);&nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n* I have a number between 1 and 10. *&quot;);&nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n*&nbsp; &nbsp;&nbsp; Can you guess my number?&nbsp; &nbsp; &nbsp; &nbsp; *&quot;);&nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n*&nbsp; &nbsp;&nbsp; Please type your guess:&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; *&quot;);&nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n***************************************\n\n&quot;);&nbsp; &nbsp; &nbsp; &nbsp; scanf(&quot;%d&quot;, &amp;iGuess);&nbsp; &nbsp; &nbsp; &nbsp; iGuessMade++;&nbsp; &nbsp; //iGuessMade counts number of times guessed.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (iGuess == iRandom)&nbsp; &nbsp; //Test if guess is the same as random value.&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n\n**********************************************&quot;);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n*&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Excellent!&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; *&quot;);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n*&nbsp; &nbsp; &nbsp; You guessed the right number!&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; *&quot;);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n* That was guess number %d. Can you beat it? *&quot;, iGuessMade);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n*&nbsp;&nbsp; Would you like to play again (y or n)?&nbsp;&nbsp; *&quot;);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n**********************************************\n\n&quot;);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; scanf(&quot;%c&quot;, &amp;cExit);&nbsp; &nbsp; //This is the scanf that is not working&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (toupper (cExit) == 'Y'){&nbsp; &nbsp; //toupper to accept upper or lower case.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; iRandom = (rand() % 10)+1;&nbsp; &nbsp; //Randomize again for new value in next game if y chosen.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; iGuessMade=0;&nbsp; &nbsp; //Resets number of guesses if user plays again.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (iGuess &gt; iRandom)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n\n**************************************&quot;);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n*&nbsp; &nbsp; %d is too High!&nbsp; Try Again.&nbsp; &nbsp;&nbsp; *&quot;, iGuess);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n*&nbsp; &nbsp; That was guess number %d.&nbsp; &nbsp; &nbsp; *&quot;, iGuessMade);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n**************************************\n\n&quot;);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; //Test if iGuess is too high.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n\n**************************************&quot;);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n*&nbsp; &nbsp;&nbsp; %d is too Low!&nbsp; Try Again.&nbsp; &nbsp;&nbsp; *&quot;, iGuess);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n*&nbsp; &nbsp; &nbsp; That was guess number %d.&nbsp; &nbsp;&nbsp; *&quot;, iGuessMade);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; printf(&quot;\n**************************************\n\n&quot;);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; //Output if iGuess is too low, only other option if previous tests fail.&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; } while (toupper (cExit) != 'N');&nbsp; &nbsp; //Test if cExit is not equal to N.&nbsp; Toupper compensates for upper or lower case input.&nbsp; If cExit is not N, then game replays.&nbsp; &nbsp; &nbsp; &nbsp; return 0;}</blockquote>

[QUOTE="symantec11_76, post: 767429, member: 46287"] I wrote a program that should work just fine. I compiled the same program on a Windows compiler and the program works great. However, my GCC compiler seems to be having a problem with the character type scanf within an if statement which is also within a do while loop. My default GCC version is 4.0. Anyone have any ideas. The program is below with a comment on which scanf is causing the problem. When the program gets to that scanf, it just continues on by without waiting for user input of y or n. #include <stdio.h> #include <stdlib.h> #include <time.h> //Library stdlib.h needed for srand. Library time.h needed for time randomization. main () { int iRandom=0,iGuess=0,iGuessMade=0; char cExit='\0'; //Data type calls - iRandom is random value, iGuess is for users guess, iGuessMade to count guesses and cExit is for y or n to play again. srand(time(NULL)); //srand call for rand to randomize each time iRandom = (rand() % 10)+1; //Randomize number between 0 and 999, then add 1 in order to assign values between 1 and 1000. //Randomize before first loop in order to keep same value until guessed right. do { printf("\n\n***************************************"); printf("\n* I have a number between 1 and 10. *"); printf("\n* Can you guess my number? *"); printf("\n* Please type your guess: *"); printf("\n***************************************\n\n"); scanf("%d", &iGuess); iGuessMade++; //iGuessMade counts number of times guessed. if (iGuess == iRandom) //Test if guess is the same as random value. { printf("\n\n**********************************************"); printf("\n* Excellent! *"); printf("\n* You guessed the right number! *"); printf("\n* That was guess number %d. Can you beat it? *", iGuessMade); printf("\n* Would you like to play again (y or n)? *"); printf("\n**********************************************\n\n"); scanf("%c", &cExit); //[B][COLOR="Red"]This is the scanf that is not working[/COLOR][/B] if (toupper (cExit) == 'Y'){ //toupper to accept upper or lower case. iRandom = (rand() % 10)+1; //Randomize again for new value in next game if y chosen. iGuessMade=0; //Resets number of guesses if user plays again. } } else { if (iGuess > iRandom) { printf("\n\n**************************************"); printf("\n* %d is too High! Try Again. *", iGuess); printf("\n* That was guess number %d. *", iGuessMade); printf("\n**************************************\n\n"); } //Test if iGuess is too high. else { printf("\n\n**************************************"); printf("\n* %d is too Low! Try Again. *", iGuess); printf("\n* That was guess number %d. *", iGuessMade); printf("\n**************************************\n\n"); } //Output if iGuess is too low, only other option if previous tests fail. } } while (toupper (cExit) != 'N'); //Test if cExit is not equal to N. Toupper compensates for upper or lower case input. If cExit is not N, then game replays. return 0; } [/QUOTE]

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