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PONeed to change the c++ code
 

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  1. PONeed to change the c++ code
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    <p>I wrote this code for date validation.. It works fine.. but i need to send a string and should get in this function and validate the string and return it back. how i can change the code...</p> <p>if i remove static and use prototype variables i am not getting desired output.. for ex..</p> <pre><code>main() { dobvalidation(b); } void dobvalidation(string b) { //validates } </code></pre> <p>i need in above format.. this is my code</p> <pre><code>#include &lt;iostream&gt; #include &lt;string&gt; #include &lt;cstring&gt; #include &lt;stdlib.h&gt; #include &lt;ctime&gt; using namespace std; void checkFormat(); void dobValidation(); static string input; int main() { cout&lt;&lt;"Enter date of birth (dd-mm-yyyy)\n"; getline(cin,input,'\n'); checkFormat(); dobValidation(); return 0; } void checkFormat() { //check the length of the string int len=input.size(); if(len!=10) { cout&lt;&lt;"\nPlease enter a valid Date of Birth\n"; cin&gt;&gt;input; checkFormat(); return; } char * val; val = const_cast&lt;char*&gt;((input.substr(2,1)).c_str()); //check for the dashes in dob if(strcmp(val,"-")!=0) { cout&lt;&lt;"\nPlease enter a valid Date of Birth\n"; cin&gt;&gt;input; checkFormat(); return; } val = const_cast&lt;char*&gt;((input.substr(5,1)).c_str()); if(strcmp(val,"-")!=0) { cout&lt;&lt;"\nPlease enter a valid Date of Birth\n"; cin&gt;&gt;input; checkFormat(); return; } //check for digits //extract date from string char * date; date = const_cast&lt;char*&gt;((input.substr(0,2)).c_str()); //check char by char for numeric char c; for(int i=0;i&lt;2;i++) { c = date[i]; if(!isdigit(c)) { cout&lt;&lt;"\nPlease enter a valid Date of Birth\n"; cin&gt;&gt;input; checkFormat(); return; } } //extract month from string char * month; month = const_cast&lt;char*&gt;((input.substr(3,2)).c_str()); //check char by char for numeric for(int i=0;i&lt;2;i++) { c = month[i]; if(!isdigit(c)) { cout&lt;&lt;c; cout&lt;&lt;"\nPlease enter a valid Date of Birth\n"; cin&gt;&gt;input; checkFormat(); return; } } //extract year from string char * year; year = const_cast&lt;char*&gt;((input.substr(6,4)).c_str()); //check char by char for numeric for(int i=0;i&lt;4;i++) { c = year[i]; if(!isdigit(c)) { cout&lt;&lt;"\nPlease enter a valid Date of Birth\n"; cin&gt;&gt;input; checkFormat(); return; } } return; } void dobValidation() { // cout&lt;&lt;dob; //date char * date1; date1 = const_cast&lt;char*&gt;((input.substr(0,2)).c_str()); int dd=atoi(date1); //month char * month1; month1 = const_cast&lt;char*&gt;((input.substr(3,2)).c_str()); int mm=atoi(month1); //year char * year1; year1 = const_cast&lt;char*&gt;((input.substr(6,4)).c_str()); int yyyy=atoi(year1); //cout&lt;&lt;dd&lt;&lt;mm&lt;&lt;yyyy; int days[12]={31,28,31,30,31,30,31,31,30,31,30,31}; int max_no_of_day = days[mm-1]; //check for leap year if((yyyy%400 ==0 || (yyyy%100 != 0 &amp;&amp; yyyy%4 == 0) ) &amp;&amp; mm==1) { max_no_of_day=29; } // check date doesnt cross the max limit if(dd &gt; max_no_of_day || dd&lt;1) { // cout&lt;&lt;"max"&lt;&lt;max_no_of_day&lt;&lt;endl; // cout&lt;&lt;dd&lt;&lt;mm&lt;&lt;yyyy; cout&lt;&lt;"\nPlease enter a valid Date of Birth\n"; cin&gt;&gt;input; dobValidation(); return; } // month validation if(mm &gt;12 || mm&lt;1) { cout&lt;&lt;"\nPlease enter a valid Date of Birth\n"; cin&gt;&gt;input; dobValidation(); return; } //year verification time_t t = time(0); // get time now struct tm * now = localtime( &amp; t ); //convert to local time int current_year = (now-&gt;tm_year + 1900); int current_month = (now-&gt;tm_mon + 1); int current_date = (now-&gt;tm_mday); // date should not exceed current date if(yyyy==current_year &amp;&amp; mm&gt;current_month) { cout&lt;&lt;"\nPlease enter a valid Date of Birth\n"; cin&gt;&gt;input; dobValidation(); return; } if(yyyy==current_year &amp;&amp; mm==current_month &amp;&amp; dd&gt;current_date) { cout&lt;&lt;"\nPlease enter a valid Date of Birth\n"; cin&gt;&gt;input; dobValidation(); return; } //check whether year crossed current year if(yyyy&gt;current_year || yyyy&lt;1900) { cout&lt;&lt;"\nPlease enter a valid Date of Birth\n"; cin&gt;&gt;input; dobValidation(); return; } return; } </code></pre>
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    1. CODo not const_cast. change your variables from `char *` to `const char *`
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    2. COOr just don't use C-strings when there is no need and avoid the casts altogether.
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      1. USDuck
 

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