Pointer
Programs
1.
Write a user defined function which will swap the values of two variables
declared locally in the main program.
#include<stdio.h>
void
swap(int *p, int*q);
void
main()
{
int a=4,b=5;
printf("\n Before swap %d -
%d",a,b);
swap(&a,&b);
printf("\n After swap %d -
%d",a,b);
}
void
swap(int *p, int *q)
{
int t;
t=*p;
*p=*q;
*q=t;
}
2. Write a user defined function calc(), which will returns the sum, subtraction, multiplication, and division values of two variable locally declared in the main function.
#include<stdio.h>
void
calc( int,int);
void
main()
{
int
no1,no2;
void
(*p) (int, int);
printf("\n
Enter no1");
scanf("%d",
&no1);
printf("\n
Enter no2");
scanf("%d",
&no2);
p
= &calc;
(*p)
(no1,no2);
}
void
calc(int no1,int no2)
{
int
add,mul,sub,div;
add=no1+no2;
mul=no1*no2;
sub=no1-no2;
div=no1/no2;
printf("\n
Addition is %d \n Mul is %d \n Subtraction is %d \n Div is %d", add,mul,sub,div);
}
3. Write a user defined function which will return the length of the string declared locally in the main function.
#include<stdio.h>
int
findlength(char *p);
void
main()
{
char string[10];
int ans;
printf("\n Enter string");
scanf("%s", string);
ans=findlength(string);
printf("\n Length of string is
%d", ans);
}
int
findlength(char *p)
{
int i=0;
while(*p !=NULL)
{
p++;
i++;
}
return(i);
}
4. Write a program, which takes a name of the user in the lowercase letters. Call a user defined function upper which will convert all lowercase letters into the uppercase letter. Finally print the string.
#include<stdio.h>
#include<ctype.h>
void
convup(char *p);
void
main()
{
char string[10];
printf("\n Enter string");
scanf("%s", string);
convup(string);
}
void
convup(char *p)
{
while(*p !=NULL)
{
printf("%c",toupper(*p));
p++;
}
}
5. Write a user defined function to reverse the given string.
#include<stdio.h>
void
rev(char *p);
void
main()
{
char string[10];
printf("\n Enter string");
scanf("%s", string);
rev(string);
}
void
rev(char *p)
{
int i=0,j;
while(*p !=NULL)
{
p++;
i++;
}
p--;
for(j=i;j>=0;j--)
{
printf("%c",*p);
p--;
}
}
6. Create a structure product with ProductCode (int), Name (char array) and Price data elements. In the main function declare p[5] of product. Do the necessary data entry for all five products. Pass the base address of an array to user defined function inc_price(), which will increase the price of all the products by 10%. Print all the products with all the details again after increasing the price.
#include<stdio.h>
struct item
{
int code;
char name[10];
int price;
};
void inc(struct item it[],int x);
void
main()
{
struct item it[5];
int i;
for(i=0;i<5;i++)
{
printf("\n enter
code, name and price");
scanf("%d%s%d",
&it[i].code, it[i].name, &it[i].price);
}
inc(it,5);
}
void inc(struct item it[],int x)
{
int i;
for(i=0;i<5;i++)
{
it[i].price +=
it[i].price*0.01;
printf("\n %d %s
%d", it[i].code,it[i].name,it[i].price);
} }
7.
Create a structure student with rollno (int), name (char array), marks (int),
grade (char). Create an array stu[5] of type student. Take the details of
students like rollno, name, and marks from the user. Call UDF prepare_result()
which will store the values for grade based on marks (if marks >=75 then
‘A’, Between 60 to 75 ‘B’, Between 50 to 60 ‘C’, Between 35 to 50 ‘D’ and Below
35 ‘F’ grade). Print the details of the students with Grade.
#include<stdio.h>
struct
student
{
int
no;
char
name[10];
int
m;
char
g;
};
void
findg(struct student s[],int x);
void
main()
{
struct
student s[5];
int
i;
for(i=0;i<5;i++)
{
printf("\n
enter no, name and marks");
scanf("%d%s%d",
&s[i].no, s[i].name, &s[i].m);
}
findg(s,5);
}
void
findg(struct student s[],int x)
{
int
i;
for(i=0;i<5;i++)
{
if(s[i].m>=75)
s[i].g = 'A';
else if(s[i].m>=60)
s[i].g = 'B';
else if(s[i].m>=50)
s[i].g = 'C';
else if(s[i].m>=35)
s[i].g = 'D';
else
s[i].g='F';
printf("\n
%d %s %d %c", s[i].no,s[i].name,s[i].m,s[i].g);
}
}
