C-Kurs/(Pointer) Swapping/Musterlösung: Unterschied zwischen den Versionen
< C-Kurs | (Pointer) Swapping
PaulG (Diskussion | Beiträge) K (verschob „Ckurs/(Pointer) Swapping/Musterlösung“ nach „C-Kurs/(Pointer) Swapping/Musterlösung“) |
|||
| (Eine dazwischenliegende Version von einem anderen Benutzer wird nicht angezeigt) | |||
| Zeile 163: | Zeile 163: | ||
print_int_array("front", front, length); | print_int_array("front", front, length); | ||
print_int_array("back ", back, length); | print_int_array("back ", back, length); | ||
| − | + | ||
return 0; | return 0; | ||
} | } | ||
| Zeile 224: | Zeile 224: | ||
int length= sizeof(a) / sizeof(int); | int length= sizeof(a) / sizeof(int); | ||
| − | + | ||
// a and b are constant | // a and b are constant | ||
// alternatively, you can use calloc | // alternatively, you can use calloc | ||
| Zeile 241: | Zeile 241: | ||
float c[]= {1.0, 2.0, 3.0, 4.0}; | float c[]= {1.0, 2.0, 3.0, 4.0}; | ||
float d[]= {5.0, 6.0, 7.0, 8.0}; | float d[]= {5.0, 6.0, 7.0, 8.0}; | ||
| − | + | ||
length= sizeof(c) / sizeof(int); | length= sizeof(c) / sizeof(int); | ||
Aktuelle Version vom 5. März 2013, 17:37 Uhr
1. Teilaufgabe
#include <stdio.h>
void swap(int *x, int *y) {
int temp= *x;
*x= *y;
*y= temp;
}
int main(){
int i= 1;
int j= 2;
printf("i: %i j: %i\n", i, j);
swap(&i, &j);
printf("i: %i j: %i\n", i, j);
return 0;
}
2. Teilaufgabe
#include <stdio.h>
void swap(int *x, int *y) {
int temp= *x;
*x= *y;
*y= temp;
}
void print_int_array(char* name, int* array, int size){
int i;
printf("%s:", name);
for(i= 0; i<size; i++){
printf(" %i", array[i]);
}
printf("\n");
}
int main(){
int a[]= {1, 2, 3, 4};
int b[]= {5, 6, 7, 8};
int length= sizeof(a) / sizeof(int);
print_int_array("a", a, length);
print_int_array("b", b, length);
int i;
for(i=0; i<length; i++){
swap(&a[i], &b[i]);
}
print_int_array("a", a, length);
print_int_array("b", b, length);
return 0;
}
3.Teilaufgabe
#include <stdio.h>
void swap(int **x, int **y) {
int* temp= *x;
*x= *y;
*y= temp;
}
int main(){
int i= 1;
int j= 2;
int* p1= &i;
int* p2= &j;
printf("------------------------------------------\n");
printf("before swap:\n");
printf("------------------------------------------\n");
printf(" p1:\t%p\t p2:\t%p\n", p1, p2);
printf("*p1:\t%10i\t*p2:\t%10i\n", *p1, *p2);
printf(" i:\t%10i\t j:\t%10i\n", i, j);
swap(&p1, &p2);
printf("------------------------------------------\n");
printf("after swap:\n");
printf("------------------------------------------\n");
printf(" p1:\t%p\t p2:\t%p\n", p1, p2);
printf("*p1:\t%10i\t*p2:\t%10i\n", *p1, *p2);
printf(" i:\t%10i\t j:\t%10i\n", i, j);
return 0;
}
4.Teilaufgabe
#include <stdio.h>
void swap(int **x, int **y) {
int* temp= *x;
*x= *y;
*y= temp;
}
void print_int_array(char* name, int* array, int size){
int i;
printf("%s:", name);
for(i= 0; i<size; i++){
printf(" %i", array[i]);
}
printf("\n");
}
int main(){
int a[]= {1, 2, 3, 4};
int b[]= {5, 6, 7, 8};
int length= sizeof(a) / sizeof(int);
// a and b are constant
// alternatively, you can use calloc
int *front= &a[0];
int *back= &b[0];
print_int_array("front", front, length);
print_int_array("back ", back, length);
swap(&front, &back);
print_int_array("front", front, length);
print_int_array("back ", back, length);
return 0;
}
5. Teilaufgabe
#include <stdio.h>
void swap(void **x, void **y) {
void *temp = *x;
*x = *y;
*y = temp;
}
void print_int_array(char* name, int* array, int size){
int i;
printf("%s:", name);
for(i= 0; i<size; i++){
printf(" %i", array[i]);
}
printf("\n");
}
void print_float_array(char* name, float* array, int size){
int i;
printf("%s:", name);
for(i= 0; i<size; i++){
printf(" %f", array[i]);
}
printf("\n");
}
int main(){
int i= 1;
int j= 2;
int* p1= &i;
int* p2= &j;
printf("i: %i j: %i\n", *p1, *p2);
swap((void*)&p1, (void*)&p2);
printf("i: %i j: %i\n", *p1, *p2);
int a[]= {1, 2, 3, 4};
int b[]= {5, 6, 7, 8};
int length= sizeof(a) / sizeof(int);
// a and b are constant
// alternatively, you can use calloc
p1= &a[0];
p2= &b[0];
print_int_array("a", p1, length);
print_int_array("b", p2, length);
swap((void**)&p1, (void**)&p2);
print_int_array("a", p1, length);
print_int_array("b", p2, length);
float c[]= {1.0, 2.0, 3.0, 4.0};
float d[]= {5.0, 6.0, 7.0, 8.0};
length= sizeof(c) / sizeof(int);
// c and d are constant
// alternatively, you can use calloc
float *p3= &c[0];
float *p4= &d[0];
print_float_array("x", p3, length);
print_float_array("y", p4, length);
swap((void**)&p3, (void**)&p4);
print_float_array("x", p3, length);
print_float_array("y", p4, length);
return 0;
}
