practice program on C

main2.c

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char **argv)
{
    char pword[100];
    int uc,d,sp,i=1,maxval=0,l;
    printf("Please enter the password\n");
    scanf( " %s", pword);
    for ( l=0; pword[l]!= NULL;l++)
    {
        maxval++;
    }
    printf("maxval is %d\n",maxval);
   // printf ("The entered password is %s\n",pword);
    for(i=0;i<=maxval;i++)
    {   uc=pword[i];
        d=pword[i];
        sp=pword[i];
        if(isalpha(uc))
        {if(isupper(uc))
            {
            uc=pword[i];
            //printf("%c\n",uc);
            //break;
            }
        }
        else if (isdigit(d))
        {
            d=pword[i];
            //printf("%c\n",d);
        }
        else if (sp=='$')
        {
            sp=pword[i];
            //printf("%c\n",sp);
            printf("Correct password\n");
            break;
        }else {printf("Error!!");break;}
       /* if (isupper(uc)==uc && isdigit(d)==d && sp=='$')
        {
            printf("Correct password");
        }else {i++;continue;printf("try again");}*/
    }
    
	return 0;
}

password.c

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char **argv)
{
    char pword[100];
    int uc,d,sp,i=1,maxval=0,l;
    printf("Please enter the password\n");
    scanf( " %s", pword);
    for ( l=0; pword[l]!= NULL;l++)
    {
        maxval++;
    }
    printf("maxval is %d\n",maxval);
   // printf ("The entered password is %s\n",pword);
    for(i=0;i<=maxval;i++)
    {   uc=pword[i];
        d=pword[i];
        sp=pword[i];
        if(isalpha(uc))
        {if(isupper(uc))
            {
            uc=pword[i];
            //printf("%c\n",uc);
            //break;
            }
        }
        else if (isdigit(d))
        {
            d=pword[i];
            //printf("%c\n",d);
        }
        else if (sp=='$')
        {
            sp=pword[i];
            //printf("%c\n",sp);
            printf("Correct password\n");
            break;
        }else {printf("Error!!");break;}
       /* if (isupper(uc)==uc && isdigit(d)==d && sp=='$')
        {
            printf("Correct password");
        }else {i++;continue;printf("try again");}*/
    }
    
	return 0;
}

samecode.c

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char **argv)
{
    char pword[100];
    int uc,d,sp,i=1,maxval=0,l;
    printf("Please enter the password\n");
    scanf( " %s", pword);
    for ( l=0; pword[l]!= NULL;l++)
    {
        maxval++;
    }
    printf("maxval is %d\n",maxval);
   // printf ("The entered password is %s\n",pword);
    for(i=0;i<=maxval;i++)
    {   uc=pword[i];
        d=pword[i];
        sp=pword[i];
        if(isalpha(uc))
        {if(isupper(uc))
            {
            uc=pword[i];
            //printf("%c\n",uc);
            //break;
            }
        }
        else if (isdigit(d))
        {
            d=pword[i];
            //printf("%c\n",d);
        }
        else if (sp=='$')
        {
            sp=pword[i];
            //printf("%c\n",sp);
            printf("Correct password\n");
            break;
        }else {printf("Error!!");break;}
       /* if (isupper(uc)==uc && isdigit(d)==d && sp=='$')
        {
            printf("Correct password");
        }else {i++;continue;printf("try again");}*/
    }
    
	return 0;
}