Write a program to print the following output-
Enter your name:
Mr. Jhon Snow [This line will be given by the user]
Hello!! Mr. Jhon Snow
Code:
#include<stdio.h>
#include<string.h>
int main()
{
char str[100];
gets(str);
printf("Hello!! Mr.%s\n",str);
return 0;
} Take a word from user and print the word in reverse order. [If user gives “BANGLADESH”, your program should print “HSEDALGNAB”]
Code:
#include<stdio.h>
#include<string.h>
int main()
{
char str[100];
int length,i;
scanf("%s",str);
length=strlen(str);
for(i=length;i>=0;i--)
{
printf("%c",str[i]);
}
printf("\n");
return 0;
} Find the length of a given string.[If user gives input “LovE”, you should print: 4]
Code:
#include<stdio.h>
#include<string.h>
int main()
{
char str[100];
int length=0,i=0;
scanf("%s",str);
while(1)
{
if(str[i]=='\0')
{
break;
}
else
{
i++;
length++;
}
}
printf("%d",length);
return 0;
} Take a string as input from the user and print the every single character of it into a separate line. If user gives “DHAKA”, output should look like the following-
D
H
A
K
A
Code:
#include<stdio.h>
#include<string.h>
int main()
{
char str[1000];
int i;
scanf("%s",str);
for(i=0;i<strlen(str);i++)
{
printf("%c\n",str[i]);
}
return 0;
} Take three different string as input from the user(“We”, “ Love” and “ Bangladesh”). Now concate these three string and print it (“We Love Bangladesh”). [There is a leading space in “ Love” and “ Bangladesh”]
Code:
#include<stdio.h>
#include<string.h>
int main()
{
char str1[3]="We";
char str2[6]=" Love";
char str3[12]=" Bangladesh";
char str4[35];
int length,i,j=0,k;
for(i=0;i<strlen(str1);i++)
{
str4[j++]=str1[i];
}
for(i=0;i<strlen(str2);i++)
{
str4[j++]=str2[i];
}
for(i=0;i<strlen(str3);i++)
{
str4[j++]=str3[i];
}
str4[j]='\0';
printf("%s\n",str4);
return 0;
} Write a program which takes a string of alphabet as input and replace all the characters with the 3rd immediate character of it. All the alphabets of the input string will be small letter. [If user gives input “abc” you should print “def”, if user gives input “xyz” you should print “abc”]
Code:
#include<stdio.h>
#include<string.h>
int main()
{
char str[1000];
int i;
scanf("%s",str);
for(i=0;i<strlen(str);i++)
{
if(str[i]>=120 && str[i]<=123)
{
printf("%c",str[i]-23);
}
else
{
printf("%c",str[i]+3);
}
}
return 0;
} You are given a string mixed with uppercase and lowercase letters . Your task is to write a program which will flip the letters (UpperCase -> LowerCase, LowerCase -> UpperCase).
Example: INPUT: OUTPUT:
eLepHanT Elephant
cAt Cat
SuNDAY Sunday
Code:
#include<stdio.h>
#include<string.h>
int main()
{
char str[1000];
int i;
scanf("%s",str);
if(str[0]>=97 && str[0]<=122)
str[0]=str[0]-32;
printf("%c",str[0]);
for(i=1;i<strlen(str);i++)
{
if(str[i]>=65 && str[i]<=91)
printf("%c",str[i]+32);
else
printf("%c",str[i]);
}
return 0;
} Write a program which will take a sentence as input and tell us how many words are there. [If user gives input “I love Bangladesh”, then the output should be: 3]
Code:
#include<stdio.h>
#include<string.h>
int main()
{
char str[1000];
int i,word_count=1;
gets(str);
for(i=0;i<strlen(str);i++)
{
if(str[i]==' ')
word_count++;
}
printf("%d\n",word_count);
return 0;
} A string is palindrome if it seems same from the both side. Like “ABA”, “XXYXX”, “M” all are palindromes and “XY” is not a palindrome. Now write a program which will take a string as input from the user and print “YES, It is a palindrome” if it satisfies the condition otherwise print “No, It is not a palindrome”.
Code:
#include<stdio.h>
#include<string.h>
int main()
{
char str[100];
int length,i,flag=0;
scanf("%s",str);
length=strlen(str)-1;
for(i=0;i<=length/2;i++)
{
if(str[i]==str[length-i])
flag=1;
else
flag=0;
}
if(flag==0)
{
printf("No, It is not a palindrome\n");
}
else
{
printf("YES, It is a palindrome\n");
}
return 0;
} Let’s take a string and you have to find how many alphabets are there and their repetitions. Case sensitive.
Ex: Input: Output:
AaaBBc A(1)B(2)a(2)c(1)
Code:
#include<stdio.h>
#include<string.h>
int main()
{
char str[1000];
int i;
int arr[123];
scanf("%s",str);
for(i=0;i<123;i++)arr[i]=0;
for(i=0;i<strlen(str);i++)
{
arr[str[i]]++;
}
for(i=0;i<123;i++)
{
if(arr[i]!=0)
printf("%c(%d)",i,arr[i]);
}
return 0;
}