initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
2024-06-14 05:50:02
initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
../src/yongqiang.c:29:15: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
1. Node *head = root;
//============================================================================
// Name : typedef - struct
// Author : Yongqiang Cheng
// Version : Version 1.0.0
// Copyright : Copyright (c) 2019 Yongqiang Cheng
// Description : Hello World in C++, Ansi-style
//============================================================================/*** Insert into an ordered, singly linked list. The arguments are** a pointer to the first node in the list, and the value to insert.*/#include <stdio.h>
#include <stdlib.h>#define FALSE 1
#define TRUE 0typedef struct NODE
{struct NODE *link;int value;
} Node;// This function prints contents of linked list starting from the given node.
int sll_display(const Node *root)
{Node *head = root;if (NULL == root){return FALSE;}printf("\n[ ");while (NULL != head){printf("%d ", head->value);head = head->link;}printf("]");return TRUE;
}int sll_insert(Node **rootp, int new_value)
{Node *current;Node *previous;Node *new_node;if (NULL == rootp){return FALSE;}/*** Get the pointer to the first node.*/current = *rootp;previous = NULL;/*** Look for the right place by walking down the list** until we reach a node whose value is greater than or equal to the new value.*/while ((NULL != current) && (current->value < new_value)){previous = current;current = current->link;}/*** Allocate a new node and store the new value into it.** In this event, we return FALSE.*/new_node = (Node *) malloc(sizeof(Node));if (NULL == new_node){return FALSE;}new_node->value = new_value;/*** Insert the new node into the list, and return TRUE.*/new_node->link = current;if (NULL == previous){*rootp = new_node;}else{previous->link = new_node;}return TRUE;
}int main()
{Node *root = NULL;int result = 0;int ret = 0;ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 5);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 10);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 15);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 9);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 12);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 0);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 20);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}return TRUE;
}16:47:30 **** Build of configuration Debug for project yongqiang_example ****
make all
Building file: ../src/yongqiang.c
Invoking: GCC C Compiler
gcc -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/yongqiang.d" -MT"src/yongqiang.o" -o "src/yongqiang.o" "../src/yongqiang.c"
../src/yongqiang.c: In function ‘sll_display’:
../src/yongqiang.c:29:15: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]Node *head = root;^
Finished building: ../src/yongqiang.cBuilding target: yongqiang_example
Invoking: GCC C Linker
gcc -o "yongqiang_example" ./src/yongqiang.o
Finished building target: yongqiang_example16:47:31 Build Finished (took 595ms)
NULL pointer.
[ 5 ]
[ 5 10 ]
[ 5 10 15 ]
[ 5 9 10 15 ]
[ 5 9 10 12 15 ]
[ 0 5 9 10 12 15 ]
[ 0 5 9 10 12 15 20 ]
2. const Node *head = root;
//============================================================================
// Name : typedef - struct
// Author : Yongqiang Cheng
// Version : Version 1.0.0
// Copyright : Copyright (c) 2019 Yongqiang Cheng
// Description : Hello World in C++, Ansi-style
//============================================================================/*** Insert into an ordered, singly linked list. The arguments are** a pointer to the first node in the list, and the value to insert.*/#include <stdio.h>
#include <stdlib.h>#define FALSE 1
#define TRUE 0typedef struct NODE
{struct NODE *link;int value;
} Node;// This function prints contents of linked list starting from the given node.
int sll_display(const Node *root)
{const Node *head = root;if (NULL == root){return FALSE;}printf("\n[ ");while (NULL != head){printf("%d ", head->value);head = head->link;}printf("]");return TRUE;
}int sll_insert(Node **rootp, int new_value)
{Node *current;Node *previous;Node *new_node;if (NULL == rootp){return FALSE;}/*** Get the pointer to the first node.*/current = *rootp;previous = NULL;/*** Look for the right place by walking down the list** until we reach a node whose value is greater than or equal to the new value.*/while ((NULL != current) && (current->value < new_value)){previous = current;current = current->link;}/*** Allocate a new node and store the new value into it.** In this event, we return FALSE.*/new_node = (Node *) malloc(sizeof(Node));if (NULL == new_node){return FALSE;}new_node->value = new_value;/*** Insert the new node into the list, and return TRUE.*/new_node->link = current;if (NULL == previous){*rootp = new_node;}else{previous->link = new_node;}return TRUE;
}int main()
{Node *root = NULL;int result = 0;int ret = 0;ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 5);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 10);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 15);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 9);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 12);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 0);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}result = sll_insert(&root, 20);if (result){printf("Failed to insert element.");}ret = sll_display(root);if (ret){printf("NULL pointer.");}return TRUE;
}16:44:22 **** Build of configuration Debug for project yongqiang_example ****
make all
Building file: ../src/yongqiang.c
Invoking: GCC C Compiler
gcc -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/yongqiang.d" -MT"src/yongqiang.o" -o "src/yongqiang.o" "../src/yongqiang.c"
Finished building: ../src/yongqiang.cBuilding target: yongqiang_example
Invoking: GCC C Linker
gcc -o "yongqiang_example" ./src/yongqiang.o
Finished building target: yongqiang_example16:44:23 Build Finished (took 602ms)
NULL pointer.
[ 5 ]
[ 5 10 ]
[ 5 10 15 ]
[ 5 9 10 15 ]
[ 5 9 10 12 15 ]
[ 0 5 9 10 12 15 ]
[ 0 5 9 10 12 15 20 ]
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