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Commit88a78d8

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author
ssjssh
committed
完成leecode第7题。
1 parentd89a2c8 commit88a78d8

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2 files changed

+76
-1
lines changed

2 files changed

+76
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lines changed

‎.gitignore

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Original file line numberDiff line numberDiff line change
@@ -58,4 +58,8 @@ docs/_build/
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# PyBuilder
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target/
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test.py
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test.py
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#c out file
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*.out
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*.exe

‎src/ssj/leecode/reverse_integer.c

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@@ -0,0 +1,71 @@
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/**
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*本题目使用C编写，因为Python的int类型是无限大的，要判断一个数字是否溢出非常简单，祝需要和2^32-1比较就好了
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*/
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#include<stdio.h>
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#include<string.h>
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#include<limits.h>
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intintToString(inti,char*arr){
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intt_len=sprintf(arr,"%d",i);
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arr[t_len]='\0';
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returnt_len;
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}
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intwillOverflow(char*result,intis_negative){
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charmin_str[40];
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charmax_str[40];
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intmax_len=intToString(INT_MAX,max_str);
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intmin_len=intToString(INT_MIN,min_str);
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intresult_len=strlen(result);
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if((is_negative&&result_len<min_len)|| (!is_negative&&result_len<max_len)){
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return0;
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}
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returnis_negative?(strcmp(min_str,result)<0):(strcmp(max_str,result)<0);
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}
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intreverse(intx) {
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char*s_char,*tar_c;
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intresult=0;
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charintStr[40];
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intis_negative=0;
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tar_c=intStr;
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if(x<0){
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*tar_c='-';
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tar_c++;
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x=-x;
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is_negative=1;
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}
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while(x>0){
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*tar_c=x%10+'0';
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x /=10;
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tar_c++;
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}
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*tar_c='\0';
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if(willOverflow(intStr,is_negative)){
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return0;
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}
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for(tar_c=intStr;(*tar_c)!='\0';tar_c++){
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if ((*tar_c)!='-'){
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result *=10;
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result+= (*tar_c)-'0';
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}
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}
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if(intStr[0]=='-'){
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result=-result;
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}
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returnresult;
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}
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intmain(){
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printf("%d\n",reverse(1231312));
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printf("%d\n",reverse(123));
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printf("%d\n",reverse(-1231312));
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printf("%d\n",reverse(1000000003));
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printf("%d\n",reverse(-1000000003));
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return0;
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}

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