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Variable Assignment Solution using C


Pointer Activity

  1. Create variables for a character, a string, an integer, and a floating-point number.
  2. Create pointers for each of those variables. Ideally, use the same name as the variable but add a p in front of the name (For example: (total and total)
  3. Ask the user to enter information for each of these variables one at a time. For each variable tell them what they should enter. (For example: “Enter a single character” or “Enter a floating-point number”) Read in the information and put it in the variables.
  4. Make each pointer point to the respective variable.
  5. Print out values for the four variables without using the variables themselves. Only use the pointers.
  6. In addition print out the addresses of the memory locations that each pointer points to.
  7. The output should look like the bottom sample.

Character: h

Integer: 8

String: Manny

Floating Point: 4.5

Character Pointer: XXXXXXXX

Integer Pointer: XXXXXXXX

String Pointer: XXXXXXXX

Solution:

#include < stdio.h> #include < string.h> /* * Pointer Activity */ int main(int argc, char** argv) { // 1. Create variables for a character, a string, an integer, and a floating point number. char a; char b[255]; int c; float d; // 2. Create pointers for each of those variables. Ideally, use the same name as the variable but add a // p in front of the name (For example: (total and ptotal) char *pa; char *pb; int *pc; float *pd; // 3. Ask the user to enter information for each of these variables one at a time. For each variable tell // them what they should enter. (For example: “Enter a single character” or “Enter a floating point // number”) Read in the information and put it in the variables. printf( "Enter a single character: " ); scanf( "%c", &a ); printf( "Enter a string: " ); scanf( "%s", b ); printf( "Enter an integer: " ); scanf( "%d", &c ); printf( "Enter a floating point number: " ); scanf( "%f", &d ); // 4. Make each pointer point to the respective variable. pa = &a; pb = b; pc = &c; pd = &d; // 5. Print out vales for the four variables without using the variables themselves. Only use the pointers. printf( "\tCharacter: %c\n", *pa ); printf( "\tInteger: %d\n", *pc ); printf( "\tString: %s\n", pb ); printf( "\tFloating Point: %f\n", *pd ); // 6. In addition print out the addresses of the memory locations that each pointer points to. printf( "\tCharacter Pointer: %p\n", pa ); printf( "\tInteger Pointer: %p\n", pc ); printf( "\tString Pointer: %p\n", pb ); printf( "\tFloating Point Pointer: %p\n", pd ); // 7. Output should look like the bottom sample. // Character: h // Integer: 8 // String: Manny // Floating Point: 4.5 // Character Pointer: XXXXXXXX // Integer Pointer: XXXXXXXX // String Pointer: XXXXXXXX return 0; }