Xcode Signal 11

paulmcco (86)
Program has exited due to signal 11 (SIGSEGV). As I understand it, this error comes from a problem allocating memory, or from memory leaks...I am somewhat new to c++...where do I find information on how to fix this problem?
here is the header file where the problem occurs, if you have a method of declaring variables that would prevent the problem, that would help! I've found some info online but it doesn't seem to fit my situation...any ideas would be appreciated:

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struct connectFlush {
	bool trueConnectFlush;
	bool connectFlush;
	int highCard;
	int trueHighCard;
	double odds[3];
}DetConnectFlush();

connectFlush DetConnectFlush(int c1, int c2, int f1, int f2, int f3, int trn, int rvr, int round, int f1SV, int f2SV, int f3SV, int trnSV, int rvrSV, int cardSV1, int cardSV2, int flushSuitVal, bool trueFlush)
{
	connectFlush infunc;
	infunc.connectFlush=false;
	infunc.trueConnectFlush=false;
	infunc.highCard=0; infunc.trueHighCard=0;
		
	int matchCount=0, lessMatchCount=0, m=0, subMatch=0,straightArr[10][5], straightNds[10][7], straight[10][5], ndsC[10][5];
	unsigned int i=0, j=0, n=0,  z=0, q=0, nds=0;
	
	for(i=0;i<3;i++){infunc.odds[i]=0;}
	int arr[8][2];
	for(i=0;i<8;i++) { for(j=0;j<2;j++) {arr[i][j]=0;}}
	arr[0][0]=c1; arr[0][1]=cardSV1; 
	arr[1][0]=c2; arr[1][1]=cardSV2; 
	arr[2][0]=f1; arr[2][1]=f1SV;
	arr[3][0]=f2; arr[3][1]=f2SV; 
	arr[4][0]=f3; arr[4][1]=f3SV; 
	arr[5][0]=trn; arr[5][1]=trnSV; 
	arr[6][0]=rvr; arr[6][1]=rvrSV;
	arr[7][0]=0; arr[7][1]=0;
	for(i=0;i<7;i++){if(arr[i][0]==14){arr[7][0]=1; arr[7][1]=arr[i][1];}}
	n=1; m=1;
	
	for(i=0;i<10;i++) {
		straightNds[i][6]=0;
		straightNds[i][5]=0;
		for(j=0;j<5;j++) {
			ndsC[i][j]=0;
			straight[i][j] = n;
			straightArr[i][j] = 0;
			straightNds[i][j] = 0;
			n++;
		}n=m+1; m++;
	}   
	for(i=0;i<10;i++) {
		for(j=0;j<5;j++) {
			for(n=0;n<8;n++) {
				if(arr[n][0]==straight[i][j] && arr[n][1]==flushSuitVal) {matchCount++; straightArr[i][j]=arr[n][0]; straight[i][j]=0;}
				for(m=0;m<7;m++) {for(z=m+1;z<8;z++) {if(arr[m][0]==arr[z][0] && arr[m][0]<=straight[i][4] && arr[m][0]>=straight[i][0] ){lessMatchCount++;}}}
				if(lessMatchCount==1){subMatch=1;} if(lessMatchCount==3){subMatch=2;}
				if((matchCount-subMatch)==5 ) {/*infunc.odds[2] = 1;*/ /*infunc.trueHighCard = straight[i][4];*/ cout << "STRAIGHT FLUSH DETECTED!" << endl; /*infunc.trueConnectFlush=true;*/ for(z=0;z<5;z++){cout << straightArr[i][z] << " ";}cout << endl; break;}				
			}
		}matchCount=0;
	}
	
	z=0;
	for(i=0;i<10;i++) {
		for(j=0;j<5;j++) {
			if(straightArr[i][0]!=0 && straightArr[i][j] == 0) {straightNds[i][j] = straightArr[i][0]+j; }
			if(straightArr[i][0]== 0) {straightNds[i][0] = straight[i][0];for(m=1;m<5;m++){ if(straightNds[i][0]+m != straightArr[i][m]){straightNds[i][m] = straightNds[i][0]+m;}} ndsC[i][z]=straightNds[i][j];z++;}
		}
	}
	z=0;
	for(i=0;i<10;i++) {
		for(j=0;j<5;j++) {
			
			if(straightNds[i][j]!=0) {nds++; ndsC[i][z]=straightNds[i][j]; z++;}
			straightNds[i][5]=nds;
			if(straightArr[i][j] == arr[0][0] || straightArr[i][j]==arr[1][0]){straightNds[i][6]=1;}
		}nds=0;z=0;
	}
	switch(round) {
		case 1:
			for(i=0;i<10;i++){ if(straightNds[i][5] > 0 && straightNds[i][5] < 3 && straightNds[i][6]==1) {/*infunc.connectFlush=true;*/ cout << "\nDETECTED POSSIBILITIES OF STRAIGHT FLUSH FOR PLAYER" << endl; break; } }
			q=0;
			for(i=0;i<10 && q<2;i++) {
				if(straightNds[i][5] < 3 && straightNds[i][5]!=0 && straightNds[i][6]==1) {/*infunc.highCard = straight[i][4];*/ cout << "Card(s) Needed: "; for(j=0;j<5;j++){if(straightNds[i][j]!=0){cout << straightNds[i][j] << " "; ndsC[i][q]=straightNds[i][j];q++;}}cout << endl; for(z=0;z<5;z++){cout << straightArr[i][z] << " ";}cout << endl; if(straightNds[i][5]==1){/*infunc.odds[0] = (1.0 / 47.0);*/ cout << "Odds Improving to Straight(by Turn): " << infunc.odds[0] << endl;} if(straightNds[i][5]==2){/*infunc.odds[1] = (1.0 / 47.0) * (1.0 / 46.0);*/ cout << "Odds Improving to Straight(by Turn): "<< infunc.odds[1] << endl;} cout << "\n" << endl;}q=0;
			}
			break;
		case 2:
			for(i=0;i<10;i++){ if(straightNds[i][5] > 0 && straightNds[i][5] < 2 && straightNds[i][6]==1) {/*infunc.connectFlush=true;*/ cout << "\nDETECTED POSSIBILITIES OF STRAIGHT FLUSH FOR PLAYER" << endl; break; } }
			q=0;
			for(i=0;i<10 && q<2;i++) {
				if(straightNds[i][5] < 2 && straightNds[i][5]!=0 && straightNds[i][6]==1) {/*infunc.highCard = straight[i][4];*/ cout << "Card(s) Needed: "; for(j=0;j<5;j++){if(straightNds[i][j]!=0){cout << straightNds[i][j] << " "; ndsC[i][q]=straightNds[i][j];q++;}}cout << endl; for(z=0;z<5;z++){cout << straightArr[i][z] << " ";}cout << endl; if(straightNds[i][5]==1){/*infunc.odds[0] = (1.0 / 46.0);*/ cout << "Odds Improving to Straight(by River): " << infunc.odds[0] << endl;} cout << "\n" << endl;}q=0;
			}
			break;
		default:
			break;
	}
	
	return infunc;
}
Last edited on
Moschops (7244)
A segFault generally happens when you try to read or rite memory that the operating system thinks you shouldn't.

Build your code with debug symbols in it, and then run it under a debugger such as gdb, or a memory tool such as valgrind, and when the segFault happens the offending line of code will be revealed to you.
paulmcco (86)
what do I do when neither gdb nor valgrind operates on my system? I'm running an eMac (mac OS x 10.3.9) I tried the oldest version of gdb(v5.3), it's not compatible...any other debuggers you'd recommend?
Moschops (7244)
Does XCode not come with a debugger?
paulmcco (86)
it does sorry, and it was gdb...it's harder to understand than windows though and it acts funny...breakpoints do nothing...found the problem the hard way...thanks!

Question though, the problem came from line 30 above...the fix was to add an else statement so that the line of code reads as so:

for(i=0;i<7;i++){if(arr[i][0]==14){arr[7][0]=1; arr[7][1]=arr[i][1];} else {arr[7][0]=0; arr[7][1]=0;}}


Does this mean that the compiler didn't know what to do with the variable (arr[7][0] & arr [7][1]) after the if statement? And therefore threw a signal 11? I ask because I have a lot of code written this way...

arr[7][0] and arr[7][1] were originally declared on line 29...doesn't the compiler ignore the if statement when the condition is not true?

Thanks!
Last edited on
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