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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. #define INT_MAX 2147483647
  5. #define INT_MIN -2147483648
  6.  
  7.  
  8. void int2str(int i, char *s) {
  9.   sprintf(s,"%d",i);
  10. }
  11.  
  12. char* extractStr(char* str, char buf[]){
  13.     char* ptr;
  14.     ptr = str;
  15.     int tmp = 0;
  16.     int idx = 0;
  17.     int negativeIdx = -1;
  18.     int isBufHasVaildNum = 0;
  19.  
  20.     memset(buf,'\0',sizeof(buf));
  21.     while(*ptr != '\0'){
  22.         tmp = (int)(*ptr);
  23.         if(tmp >= 48 && tmp <= 57){
  24.             if(tmp != 48){
  25.                 buf[idx] = *ptr;
  26.                 isBufHasVaildNum = 1;
  27.                 idx++;
  28.             }else{
  29.                 if(isBufHasVaildNum){
  30.                     buf[idx] = *ptr;
  31.                     idx++;
  32.                 }
  33.             }
  34.         }else if(tmp == 45){
  35.             buf[idx] = *ptr;
  36.             negativeIdx = idx;
  37.             idx++;
  38.         }else{
  39.             if(tmp != 32 && tmp != 43)
  40.                 break;
  41.         }
  42.         ptr++;
  43.     }
  44.  
  45.     if(negativeIdx != -1 && buf[0] != '-'){
  46.         int i = 0;
  47.         for(i = negativeIdx; buf[i] != '\0' ;i++){
  48.             buf[i] = '\0';
  49.         }
  50.     }
  51.  
  52.     if(strcmp(buf,"-") == 0){
  53.         buf[0] = '\0';
  54.     }
  55.  
  56.     return buf;
  57. }
  58.  
  59. int myAtoi(char * str){
  60.  
  61.     char buf_1[64];
  62.     char buf_2[64];
  63.     int isPostiveBefore = 1;
  64.     int isPostiveAfter = 1;
  65.     long result;
  66.  
  67.     str = extractStr(str, buf_1);
  68.     if(*str == '\0')
  69.         return 0;
  70.  
  71.     if(*str == '-'){
  72.         isPostiveBefore = 0;
  73.     }
  74.  
  75.     result = strtol(str,0,10);
  76.     memset(buf_2,'\0',sizeof(buf_2));
  77.     int2str(result, buf_2);
  78.  
  79.     printf("%s\n",str);
  80.     printf("%s\n",buf_2);
  81.  
  82.     if(buf_2[0] == '-'){
  83.         isPostiveAfter = 0;
  84.     }
  85.  
  86.     if(isPostiveBefore == 1 && isPostiveAfter == 0){
  87.         result = INT_MAX;
  88.     }
  89.  
  90.     if(isPostiveBefore == 1 && isPostiveAfter == 1){
  91.         if(strcmp(buf_2, str) != 0){
  92.             result = INT_MAX;
  93.         }
  94.     }
  95.  
  96.     if(isPostiveBefore == 0 && isPostiveAfter == 1){
  97.         result = INT_MIN;
  98.     }
  99.  
  100.     if(isPostiveBefore == 0 && isPostiveAfter == 0){
  101.         if(strcmp(buf_2, str) != 0){
  102.             result = INT_MIN;
  103.         }
  104.     }
  105.  
  106.     return result;
  107. }
  108.  
  109.  
  110.  
  111. int main(void) {
  112. 	// your code goes here
  113. 	int i = 0;
  114. 	i = myAtoi("  0000000000012345678");
  115. 	printf("%d",i);
  116.  
  117. 	return 0;
  118. }
  119.  
  120.  
Success #stdin #stdout 0s 4280KB
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stdin
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Standard input is empty
stdout
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12345678
12345678
12345678
https://ideone.com/2B5lzm
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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