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# C Programs Frequently Asked In Interviews.

 Posted Date: 24-Jul-2008 Last Updated: 24-Jul-2008 Category: My Interview Experience Author: Uttam Agrawal Member Level: Gold Points: 4

-Write a C Program to join two strings? (eg. Input “hari” &”123”
output=”hari123”) ?

int main()
{
char str1[10], str2[10];
printf("Enter the first string = ");
scanf("%s", str1);
printf("Enter the second string = ");
scanf("%s", str2);
printf("Concatenation of two strings = %s", strcat(str1, str2));
return(0);
}

-Write a program to find highest of five numbers entered by user?

int main()
{
int i, a[5], max;
printf("Enter the 5 numbers = ");
for (i=0; i<5; i++)
scanf("%d", &a[i]);
max = a[0];
for (i=1; i<5; i++)
{
if (max < a[i])
{
max = a[i];
}
}
printf("\nMaximum of 5 numbers = %d", max);
return(0);
}

-Enter a string & write a program to obtain reverse of string. Determine whether
the original and reverse strings are equal?

int main()
{
char orgstr[10], revstr[10];
int i;
printf("Enter a string = ");
scanf("%s", str);

strcpy(revstr, orgstr);
for (i=0; i {
char c = revstr[i];
revstr[i] = revstr[strlen(revstr)-i-1];
revstr[strlen(revstr)-i-1] = c;
}

printf("\nReverse of the string = %s", revstr);

if (strcmp(orgstr, revstr) == 0)
printf("The Original & Reverse strings are equal\n");

else
printf("The Original & Reverse strings are not equal\n");

return(0);
}

-Write a program to display Fibonacci series upto 70?

int main()
{
int fibonacci(int n);
int i;
printf("Fibonacci Series upto 70 is :");
for (i=1; i<11; i++)
{
printf ("%d ", fibonacci(i));
}
printf("\n");
return(0);
}

int fibonacci(int n)
{
if (n == 1 n == 2)
{
return 1;
}
else
return fibonacci(n-1) + fibonacci(n-2);
}

-Write a program to count number of words from a given sentence?

int main()
{
char sentence[100];
int i, count = 0;
printf("Enter a Sentence : \n");
gets(sentence);
for (i=0; i {
if (isspace(sentence[i]))
{
count++;
}
}
printf("Number of words in the sentence = %d", ++count);
return(0);
}

-Write a program to interchange the contents two variables?

int main()
{
int a, b;
int temp;

printf("Enter value of a & b = ");
scanf("%d %d", &a, &b);

temp = a;
a = b;
b = temp;

printf("\nValues of after interchanging a & b\n");
printf("a = %d b = %d\n\n", a, b);

return(0);
}

Reference: http://uttambpt.blogspot.com

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Responses to "C Programs Frequently Asked In Interviews. "
Author: T Syed Rizwan    03 Mar 2011Member Level: Gold   Points : 1
Hi,

Your contribution of frequently asked C interview questions was good. You have given all the important basic programs.

Hope it will be useful for persons who are attending software company interviews. I request you to contribute more questions like this which will help many in future.

Regards,
Rizwan.

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