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Message: <blockquote data-quote="Ranhiru" data-source="post: 3391414" data-attributes="member: 17748">Got this from a website...i didnt write the code though ill explain it <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" /> This is for validation if the entered numbers are actually digits and not any char values <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" />This is pretty much tough i guess for a beginner...ill try to explain line by line//First take input using a stringprintf("Enter a number :- "); gets(str); //Create variable's named flag and lenint flag,len;//Assign the value 0 to flagflag=0;//Let len take the value of how much characters are there in the string//strlen is a function defined in string.h so dont forget to include it too <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" />len = strlen(str); /* str is the number in string format*/// Now loop len times in the string (char array actually <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" /> )for(int i=0;i<len;i++) {   if(!isdigit(str))          flag=1;  //isdigit is a function in ctype.h which will return whether the character is a digit or not...so you do it for all the letters in thearray <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" /> }if(flag==0)  /* the string contains only digits*/else  /* it contains other characters*/......isdigit is defined in "ctype.h"..in case of any problem .. u can write it on your own as ..int isdigit(char c){  if(c < '0' or c > '9') return 0;  elsereturn 1;}  This is the full code that i've come up with[code]#include <stdio.h>#include <string.h>#include <ctype.h>void main(){char str[10];int len=0,flag=0;printf("Enter a number :- ");gets(str);len = strlen(str);for(int i=0;i<len;i++) {    if(!isdigit(str[i]))         flag=1; } if (flag==0) printf("Only contains digits!"); else printf("Contains non-digits");}[/code] Please ask if anything seems weird ... and if you dont understand any of this...dont worry even a bit! its your first day!!! bookmark this page and after about 2 or 3 weeks..after you have done loops and arrays just come and take a look! you will understand everything! <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" /> hope this helps and did not confuse yougud luck! <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" /></blockquote>

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