undefined reference to～によるエラーの解決法

C言語で、タスク情報を記録できるシステムを作成しています。以下のソースコードから実行しようとすると
C:\Users\AppData\Local\Temp\ccQhtmBp.o:qq.c:(.text+0x3c): undefined reference to edittask' C:\Users\\AppData\Local\Temp\ccQhtmBp.o:qq.c:(.text+0x43): undefined reference to deletetask'
のエラーが表示されプログラムがうまく実行できません。
エラーの原因及び修正箇所の提示をご教授していただけると幸いです。

c
1#include <stdio.h>
2
3void addtask();
4void viewtask();
5void edittask();
6void deletetask();
7char menu();
8
9int main() {
10    char selection ;
11   do {
12    selection = menu();
13    switch(selection) {
14        case '1': addtask(); break;
15        case '2': viewtask(); break;
16        case '3': edittask(); break;
17        case '4': deletetask(); break;
18        case '5': break;
19        default: printf("Invalid option");
20    }
21   }while(selection != '1');
22   return 0;
23}
24
25char menu() {
26    char option;
27    printf("\n1) Add New Task");
28    printf("\n2) View Task");  
29    printf("\n3) Edit Task");
30    printf("\n4) Delete Task");
31    printf("\n5) Exit");
32    printf("\nEnter option: ");
33    scanf("%c[^\n]", &option);
34    return option;
35}
36
37void addtask( ){
38    int utask, duedate, status, category, note;
39    printf("\n\n\t\t---------------------------------\n");
40    printf("\t\t* Welcome to Add Task Menu! *");
41    printf("\n\t\t---------------------------------\n\n");
42
43    FILE * f = fopen("task.txt", "r+");
44    if(f == NULL)
45            f = fopen("task.txt", "w");
46    else {
47            fseek(f, 0, SEEK_END); 
48            printf("\nEnter your Task name:");
49            scanf("%s", &utask); 
50            printf("\nEnter your Task due date[yyyy-mm-dd]: ");
51            scanf("%d", &duedate); 
52            printf("\nENTER progress percentage[0.00~100]:");
53            scanf("%f", &status); 
54            printf("\nEnter category: ");
55            scanf("%s", &category); 
56            printf("\nEnter Note: ");
57            scanf("%s", &note); 
58            fprintf(f,"%s %d %f %s %s\n", utask, duedate, status, category, note); 
59    }
60    fclose(f);
61}
62
63void viewtask(){
64  int na, d, s, c, no;
65  printf("\nThis is Your task details");
66  FILE * f = fopen("task.txt", "r");
67  while(fscanf(f,"%s",&na) != EOF){ 
68        fscanf(f,"%d",&d);
69        fscanf(f,"%f",&s);
70        fscanf(f,"%s",&c);
71        fscanf(f,"%s",&no);
72        printf("\nYour Task: %s \t Task duedate: %d \t Task progression: %f \t Task category: %s \t Task note: %s",na, d, s, c, no);
73    }
74    fclose(f);
75}
76
77void update() {
78    int utask, d, s, c, no, na;
79    FILE * f = fopen("task.txt", "r");
80    FILE * ft = fopen("tmp.txt", "w");
81    printf("\nthis is edit task"); //変更
82    printf("\nEnter your task:");
83    scanf("%s", &utask); 
84    while(fscanf(f,"%s",&na) != EOF){  
85        fscanf(f,"%d",&d);
86        fscanf(f,"%f",&s);
87        fscanf(f,"%s",&c);
88        fscanf(f,"%s",&no);
89        if(na == utask){
90            printf("\nUpdating >> your task: %s \t duedate: %d \t stasus: %f \t category: %s \t note: %s", na, d, s, c, no);
91            printf("\nEnter new duedate:");
92            scanf("%d", &d);
93            printf("\nEnter new progression:");
94            scanf("%f", &s);
95            printf("\nEnter new category:");
96            scanf("%s", &c);
97            printf("\nEnter new note:");
98            scanf("%s", &no);
99        }
100        fprintf(ft,"%s %d %f %s %s\n", na, d, s, c, no);  
101    }
102    fclose(ft);
103    fclose(f);  
104    remove("task.txt");
105    rename("tmp.txt", "task.txt");
106}
107
108void delete() {
109    int utask, d, s, c, no, na;
110    FILE * f = fopen("data.txt", "r");
111    FILE * ft = fopen("tmp.txt", "w");
112    printf("\nthis is delete record");
113    printf("\nEnter utask:");
114    scanf("%d", &utask); 
115    while(fscanf(f,"%s",&na) != EOF){
116        fscanf(f,"%d",&d);
117        fscanf(f,"%f",&s);
118        fscanf(f,"%s",&c);
119        fscanf(f,"%s",&no);
120        if(na == utask){
121            printf("\nDelete -> your task: %s \t duedate: %d \t progression: %f \t category: %s \t note: %s", na, d, s, c, no);
122            continue;
123        }
124        fprintf(ft,"%s %d %f %s %s\n", na, d, s, c, no);  
125    }
126    fclose(ft);
127    fclose(f);    
128    remove("task.txt"); 
129    rename("tmp.txt", "task.txt"); 
130}
131

Zuishin

2022/05/24 06:47

update() と delete() がそれぞれ edittask() と deletetask() の間違いだと思います。それぞれの関数名を検索して漏れなく修正し、解決したのであれば自分で回答してそれをベストアンサーに選んでください。

yuto_jake

2022/05/24 09:09

Zuishinさん、コメントありがとうございます。おっしゃる通りで、update() と delete() がそれぞれ edittask() と deletetask() の間違いでした。。ご回答ありがとうございます。

Zuishin

2022/05/24 09:09

解決したのであれば、自分で回答してそれをベストアンサーに選んで質問を閉じてください。

行動規範の内容に同意します

回答2件

自己解決

c
1#include <stdio.h>
2
3void addtask();
4void viewtask();
5void edittask();
6void deletetask();
7char menu();
8
9int main() {
10    char selection ;
11   do {
12    selection = menu();
13    switch(selection) {
14        case '1': addtask(); break;
15        case '2': viewtask(); break;
16        case '3': edittask(); break;
17        case '4': deletetask(); break;
18        case '5': break;
19        default: printf("Invalid option");
20    }
21   }while(selection != '1');
22   return 0;
23}
24
25char menu() {
26    char option;
27    printf("\n1) Add New Task");
28    printf("\n2) View Task");  
29    printf("\n3) Edit Task");
30    printf("\n4) Delete Task");
31    printf("\n5) Exit");
32    printf("\nEnter option: ");
33    scanf("%c[^\n]", &option);
34    return option;
35}
36
37void addtask( ){
38    int utask, duedate, status, category, note;
39    printf("\n\n\t\t---------------------------------\n");
40    printf("\t\t* Welcome to Add Task Menu! *");
41    printf("\n\t\t---------------------------------\n\n");
42
43    FILE * f = fopen("task.txt", "r+");
44    if(f == NULL)
45            f = fopen("task.txt", "w");
46    else {
47            fseek(f, 0, SEEK_END); 
48            printf("\nEnter your Task name:");
49            scanf("%s", &utask); 
50            printf("\nEnter your Task due date[yyyy-mm-dd]: ");
51            scanf("%d", &duedate); 
52            printf("\nENTER progress percentage[0.00~100]:");
53            scanf("%f", &status); 
54            printf("\nEnter category: ");
55            scanf("%s", &category); 
56            printf("\nEnter Note: ");
57            scanf("%s", &note); 
58            fprintf(f,"%s %d %f %s %s\n", utask, duedate, status, category, note); 
59    }
60    fclose(f);
61}
62
63void viewtask(){
64  int na, d, s, c, no;
65  printf("\nThis is Your task details");
66  FILE * f = fopen("task.txt", "r");
67  while(fscanf(f,"%s",&na) != EOF){ 
68        fscanf(f,"%d",&d);
69        fscanf(f,"%f",&s);
70        fscanf(f,"%s",&c);
71        fscanf(f,"%s",&no);
72        printf("\nYour Task: %s \t Task duedate: %d \t Task progression: %f \t Task category: %s \t Task note: %s",na, d, s, c, no);
73    }
74    fclose(f);
75}
76
77void edittask() {
78    int utask, d, s, c, no, na;
79    FILE * f = fopen("task.txt", "r");
80    FILE * ft = fopen("tmp.txt", "w");
81    printf("\nthis is edit task"); //変更
82    printf("\nEnter your task:");
83    scanf("%s", &utask); 
84    while(fscanf(f,"%s",&na) != EOF){  
85        fscanf(f,"%d",&d);
86        fscanf(f,"%f",&s);
87        fscanf(f,"%s",&c);
88        fscanf(f,"%s",&no);
89        if(na == utask){
90            printf("\nUpdating >> your task: %s \t duedate: %d \t stasus: %f \t category: %s \t note: %s", na, d, s, c, no);
91            printf("\nEnter new duedate:");
92            scanf("%d", &d);
93            printf("\nEnter new progression:");
94            scanf("%f", &s);
95            printf("\nEnter new category:");
96            scanf("%s", &c);
97            printf("\nEnter new note:");
98            scanf("%s", &no);
99        }
100        fprintf(ft,"%s %d %f %s %s\n", na, d, s, c, no);  
101    }
102    fclose(ft);
103    fclose(f);  
104    remove("task.txt");
105    rename("tmp.txt", "task.txt");
106}
107
108void deletetask() {
109    int utask, d, s, c, no, na;
110    FILE * f = fopen("data.txt", "r");
111    FILE * ft = fopen("tmp.txt", "w");
112    printf("\nthis is delete record");
113    printf("\nEnter utask:");
114    scanf("%d", &utask); 
115    while(fscanf(f,"%s",&na) != EOF){
116        fscanf(f,"%d",&d);
117        fscanf(f,"%f",&s);
118        fscanf(f,"%s",&c);
119        fscanf(f,"%s",&no);
120        if(na == utask){
121            printf("\nDelete -> your task: %s \t duedate: %d \t progression: %f \t category: %s \t note: %s", na, d, s, c, no);
122            continue;
123        }
124        fprintf(ft,"%s %d %f %s %s\n", na, d, s, c, no);  
125    }
126    fclose(ft);
127    fclose(f);    
128    remove("task.txt"); 
129    rename("tmp.txt", "task.txt"); 
130}
131