Write A Program To Create Username And Password Using File Management Concepts.



 


In this program you create two text file one is for username and second file for password.let's see


Input file for Username

ProgrammerJd

Input file for Password

Programmer@123

Code

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main(){
char str[25],pwd[20];
int a,i=0,j=0,h=0,m=0;
FILE *fp,*fp1;
char ch,ch1;
fp = fopen("user.txt", "r");
    if (fp == NULL)
    {

        printf("File not opened ");
        exit(1);
    }
    ch = fgetc(fp);
    printf("Your Username is :\n");
    while (!feof(fp))
    {
        str[i++]=ch;
        ch = fgetc(fp);
    }
    str[i]='\0';
    printf("%s",str);
    fclose(fp);

if(strcmp(str,"JayDepani")==0 || strcmp(str,"DepaniJay")==0 || strcmp(str,"JayPatel")==0 || strcmp(str,"PatelJay")==0){
printf("\n This Username is Already there,please try to other Username.");
return 0;
}
if(str[0]<'A' || str[0]>'Z'){
printf("\n First character of the Username should be Capital.");
}
for(i=0;str[i]!='\0';i++){
if(str[i]>='0' && str[i]<='9'){
m=1;
break;
}
m=0;
}
if(m==1){
printf("\n Digit is not Allow in the Username.");
}
for(i=0;str[i]!='\0';i++){
if(str[i]=='~' || str[i]=='!' || str[i]=='@' || str[i]=='#' || str[i]=='$' || str[i]=='%' || str[i]=='^' || str[i]=='&' || str[i]=='*'){
m=1;
break;
}
m=0;
}
if(m==1){
printf("\n Spacial Symbols are not Allow in Username.");
return 0;
}
fp1 = fopen("pass.txt", "r");
    if (fp1 == NULL)
    {

        printf("File not opened ");
        exit(1);
    }
    ch1 = fgetc(fp1);
    printf("\nYour Password is :\n");
    while (!feof(fp1))
    {
        pwd[j++]=ch1;
        ch1 = fgetc(fp1);
    }
    pwd[j]='\0';
    printf("%s",pwd);
    fclose(fp1);
a=strlen(pwd);
if(a<8 || a>15){
printf("\n Password length should be 8 to 15 characters.");
}
for(i=0;pwd[i]!='\0';i++){
if(pwd[i]>='0' && pwd[i]<='9'){
h=0;
break;
}
h=1;
}
if(h==1){
printf("\n Minimum one digit is complasary to use in password like 1,2,3...");
}
for(i=0;pwd[i]!='\0';i++){
if(pwd[i]=='~' || pwd[i]=='!' || pwd[i]=='@' || pwd[i]=='#' || pwd[i]=='$' || pwd[i]=='%' || pwd[i]=='^' || pwd[i]=='&' || pwd[i]=='*'){
h=0;
break;
}
h=1;
}
if(h==1){
printf("\n Must be use one Spacial Symbols in Password like ~,!,@,#,$,%,^,&,*.");
return 0;
}
for(i=0;pwd[i]!='\0';i++){
if(pwd[i]==' '){
h=1;
break;
}
h=0;
}
if(h==1){
printf("\n Password should not contain any space.");
return 0;
}
printf("\n Now Your Username is Created.\n Your Username is:%s",str);
printf("\n Now your Password is Created.\n your Password is :%s",pwd);
return 0;
}

Output



If your file is not successfully read then its give you error like this file not found.

if username and password condition is not satisfy then its give you hint how to create username and password.



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