Use of isalnum () function isn c

#include<stdio.h>
#include<ctype.h>
void main()
{
   char ch;

   for(;;)
    {
        ch=getchar();
        if(ch==' ')
            break;
        if(isalnum(ch))
            printf("%c is alphanumaric\n",ch);
    }
}

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How can we fiend a "LEAP YEAR" in C program

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 #include<stdio.h> void main() { int year; while (scanf( " %d " , & year) != EOF) { if (year % 4 == 0 && (year % 400 == 0 || year % 100 != 0 )) printf( "LEAP YEAR" ); else printf( "NOT LEAP YEAR" ); } }

Finding digit number of a number

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 #include<stdio.h> int main() { long long int a,b, sum ,temp,count = 0 ,count_1 = 1 ; while ( (scanf( "%lld %lld" , & a, & b)) != EOF) { if (a <= 1000000 && b <= 1000000 ) { sum = a + b; temp = sum ; while (temp != 0 ) { sum /= 10 ; temp = sum ; count ++ ; } printf( "%lld \n " ,count); } count = 0 ; if (count_1 > 200 ) break ; count_1 ++ ; } return 0 ; }

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