Explain the use of the functions getchar(), putchar(), gets() and puts() functions, with a suitable program
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getchar(): This function is used to read a single character from the standard input (usually the keyboard). It reads the next available character from the input stream and returns it as an unsigned char cast to an int or EOF on end-of-file or error. -
putchar(): This function is used to write a single character to the standard output (usually the console). It takes a character as an argument and writes it to the output stream. -
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Explain the meaning of the terms garbage collection, fragmentation, relocation and compaction.
What does the following C function compute? Discover.
int some fun(int n)
{
if(n%2 == 0)
return 2;
int d, s = sqrt(n);
2
for(d = 3; d <= s; d = d+2)
if(n%d == 0)
return d;
return n;
}
Suppose you wish to solve the equation for x. Rearrange this equation to get an appropriate fixed point iteration method. Then write a program to get an approximate value of the root of the equation. The initial guess must be entered by the user. Your programme must be able to flag a warning message if the initial guess is too far from the exact root. In that case, your program must be able to suggest an initial guess to the user. Terminate the program and print the current value of the root as soon as the difference between two successive approximations becomes smaller than 0.005
Explain the use of the functions getchar(), putchar(), gets() and puts() functions, with a suitable program
Arrange the following operators in descending order of their priority. If any two operators have the same priority, then specify their associativity. + =, %, +, ∗, ∗(unary), ! =, −, ++
What do you understand by file organisation? Explain the methods of file organisation.
Write the output of the following C codes, with proper justification for each.
i) main()
{
int a = 2, b = 4, c = 5;
a = b + c;
b = a + c;
c = a - b;
printf("%d,%d,%d", a, b, c);
}
ii) main()
{
printf("%d", ‘C’ + ‘P’ + ‘r’ + ‘o’ + ‘g’ + ‘r’ + ‘a’ + ‘m’);
}
iii) main()
{
int i, j = 1;
for(i = 1; i <= 10; i = i + 2)
{
j = i - j;
while(j <= 2)
printf("%d ", i+j++);
}
}
iv) main()
{
int a = 10, b = 20, c = 30;
int *p = 2;
a = c/*p;
b = c;
printf("a = %d, b = %d", a, b);
}
v) func(int x)
{
static int a = 0;
a += x;
return(a);
}
main()
{
int p;
for(p = 1; p <= 5; ++p)
printf("%d", fun(p));
}