Linux/Dev-C连双重指针也不给修改了……试验做的郁闷！
主程序 a2.c
- C/C++ code
#include"a2.h"main(){ LargeInt powerOf2 , temp ; int i ; /* Print table of powers of 2 */ Linit( powerOf2 ); Linit( temp ); LintToLarge( powerOf2 , 1 ); printf("Powers of 2 n 2^\n"); for( i = 1 ; i <= 200 ; i++ ) { printf(" %i ", i ) ; Lprint( powerOf2 ) ; printf("\n"); Ladd( temp, powerOf2, powerOf2 ) ; Lassign( powerOf2 , temp ); }}头文件 a2.h
- C/C++ code
#include<stdio.h>#include<stdlib.h>#include<math.h>#define MAX_LARGE_DIGITS 1000#define LARGE_INT_MODULE 10typedef int** LargeInt ;void Linit( LargeInt );void LintToLarge( LargeInt , const int ) ;int LtoInt( const LargeInt ) ;void Lassign( LargeInt , const LargeInt ) ;void Ladd( LargeInt , const LargeInt , const LargeInt ) ;void Lscale( LargeInt , const LargeInt , const int ) ;void Lprint( const LargeInt ) ;int Lcompare( const LargeInt , const LargeInt ) ;void Lcarry(LargeInt) ;void Linit( LargeInt intVar ){ *intVar=(int*)malloc((MAX_LARGE_DIGITS+2)*sizeof(int)); *intVar[0]=1; *intVar[1]=1; int i; for(i=2; i<=MAX_LARGE_DIGITS+1; i++) *intVar[i]=0;}void LintToLarge( LargeInt target , const int value ){ int tempValue=value; if(tempValue<0) { *target[0]=-1; tempValue*=-1; } else *target[0]=1; *target[1]=1; *target[2]=tempValue; Lcarry(target);}int LtoInt( const LargeInt source ){ if(*source[1]>5) { printf("\nLarge Int too big to fit in int."); return 0; } if(*source[1]==5) { if(*source[6]<=3) { if(*source[5]<=2) { if(*source[4]<=7) { if(*source[3]<=6) { if(((*source[2]<7)&&(*source[0]==1))||((*source[2]<8)&&(*source[0]==-1))) ; else { printf("\nLarge Int too big to fit in int."); return 0; } } } } } } int tempInt=0; int i; for(i=*source[1]+1; i>=2; i--) tempInt*=LARGE_INT_MODULE+*source[i]; return tempInt;}void Lassign( LargeInt target , const LargeInt source ){ int i; for(i=0; i<=*source[1]+1; i++) *target[i]=*source[i];}void Ladd( LargeInt target , const LargeInt leftOp , const LargeInt rightOp ){ *target[0]=1; int i; for(i=2; i<=*leftOp[1]+1; i++) *target[i]=(*leftOp[i])*(*leftOp[0]); for(i=2; i<=*rightOp[1]+1; i++) *target[i]+=(*rightOp[i])*(*rightOp[0]); if(*leftOp[1]>*rightOp[1]) *target[1]=*leftOp[1]; else *target[1]=*rightOp[1]; Lcarry(target);}void Lscale( LargeInt target , const LargeInt source , const int scaleBy ){ *target[0]=*source[0]; *target[1]=*source[1]; int i; for(i=2; i<=*source[1]+1; i++) *target[i]=(*source[i])*scaleBy; Lcarry(target);}void Lprint( const LargeInt source ){ if(*source[0]==-1) printf("-"); int i; for(i=*source[1]+1; i>=2; i--) printf ("%d", *source[i]);}int Lcompare( const LargeInt leftOp , const LargeInt rightOp ){ if(*leftOp[0]>*rightOp[0]) //if signs are different, the results are obvious return 1; else { if(*leftOp[0]<*rightOp[0]) return -1; }//Then, signs are the same, now look at absolute value int abscompare=0; if(*leftOp[1]!=*rightOp[1]) { if(*leftOp[1]>*rightOp[1]) { abscompare=1; } else abscompare=-1; } else { int i; for(i=*leftOp[1]+1; i>=2; i--) { if(*leftOp[i]>*rightOp[i]) { abscompare=1; break; } else { if(*leftOp[i]<*rightOp[i]) { abscompare=-1; break; } } } } switch(abscompare) { case 0: return 0; case 1: if(*leftOp[0]>0) return 1; else return -1; case -1: if(*leftOp[0]>0) return -1; else return 1; }}void Lcarry (LargeInt source){//Carry forward int i,j; if((*source[2]>=LARGE_INT_MODULE)&&(*source[1]==1)) { *source[3]=*source[2]/LARGE_INT_MODULE; *source[2]%=LARGE_INT_MODULE; *source[1]++; } for(i=2; i<=*source[1]+1; i++) { j=i; while(j<=*source[1]+1) { *source[j+1]+=*source[j]/LARGE_INT_MODULE; *source[j]%=LARGE_INT_MODULE; j++; if(*source[*source[1]+1]>=LARGE_INT_MODULE) { *source[*source[1]+2]=*source[*source[1]+1]/LARGE_INT_MODULE; *source[*source[1]+1]%=LARGE_INT_MODULE; *source[1]++; if(*source[1]>1000) { printf("\nCarry forward overflow!"); return; } } } }//If top digit minus, flip all digits and sign if(*source[*source[1]+1]<0) { for(i=2; i<=*source[1]+1; i++) *source[i]*=-1; *source[0]*=-1; }//Carry backword for(i=*source[1]; i>=2; i--) { j=i; while((*source[j]<0)&&(j>=2)) { *source[j+1]-=((int)log10(0-*source[j])/(int)log10(LARGE_INT_MODULE)+1); *source[j]+=LARGE_INT_MODULE*(int)log10(0-*source[j])/(int)log10(LARGE_INT_MODULE); } }//Clear unused digits i=*source[1]+1; while((*source[i]==0)&&(i>=2)) *source[1]--;}
要求是不能修改主程序。题目的要求在以前的帖子里面有：
http://topic.csdn.net/u/20071004/14/4e74124a-04a4-49cf-b569-dd5f01671b52.html
问题是我在申请内存修改二重指针的那一步立刻报内存违例……报得我莫名其妙……找了一些二重指针的例子也都跟我写的基本相同，现在要疯掉了……还是没有保护的TC3.0好……
谁能帮忙看出关键所在呢？先谢谢了……
[解决办法]
你先看看这个吧
其他的就不管了
- C/C++ code
void Linit( LargeInt intVar ){ intVar = (int**)malloc(sizeof(intVar) * (MAX_LARGE_DIGITS+2)); for(int i = 0; i < MAX_LARGE_DIGITS+2; i++) { *(intVar +i )=(int*)malloc((MAX_LARGE_DIGITS+2)*sizeof(int)); } *intVar[0]=1; *intVar[1]=1; for(i=2; i<=MAX_LARGE_DIGITS+1; i++) *intVar[i]=0;}
[解决办法]
'Lcompare' : not all control paths return a value
warning C4700: local variable 'powerOf2' used without having been initialized
warning C4700: local variable 'temp' used without having been initialized
VC6一编译就出这三个警告,都是可能导致严重错误的.现把这三个消除.
[解决办法]
poor coding habit with messy coding style
poor anything~