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#include <stdio.h> | |
#include <string.h> | |
#include <stdlib.h> | |
/* | |
* 文字の大小変換 | |
* 記号は何もしない | |
*/ | |
char convert_upper_lower(char buff) | |
{ | |
int diff_upper_lower = 'a'-'A'; | |
if ( 'A'<=buff && buff<='Z' ) { | |
return buff + diff_upper_lower; | |
} | |
if ( 'a'<=buff && buff<='z' ) { | |
return buff - diff_upper_lower; | |
} | |
return buff; | |
} | |
void replace(char *dest, char *str) | |
{ | |
/* strの文字を1文字ずつconvert_upper_lowerする */ | |
for (int i = 0; str[i] != '\0'; i++) { | |
dest[i] = convert_upper_lower(str[i]); | |
} | |
} | |
void print_data(char *dest, char *str) | |
{ | |
printf("str : %s\n", str); | |
printf("dest: %s\n", dest); | |
} | |
int main(int argc, char *argv[]) | |
{ | |
/* パラメータが無い場合はエラー出力 */ | |
if (argc == 1) { | |
fprintf(stderr, "Usage: ./a.out [string] [string] ...\n"); | |
exit(1); | |
} | |
char *str; /* インプット */ | |
char *dest; /* アウトプット */ | |
int length = 0; | |
/* | |
* パラメータ全部の文字数を取得 | |
* パラメータ間の' '、文字列の最後の'\0'も含む | |
*/ | |
for (int i=1; i < argc; i++) { | |
length += strlen(argv[i])+1; | |
} | |
/* length分のメモリを確保 */ | |
str = (char *)malloc(length); | |
dest = (char *)malloc(length); | |
/* | |
* パラメータを一つの文字列に結合 | |
* example: | |
* "This","is","a","pen" | |
* -> "This is a pen" | |
* */ | |
for (int i=1; i < argc; i++) { | |
int word_len = strlen(argv[i]); | |
strncat(str, argv[i], word_len); | |
strcat(str, " "); | |
} | |
str[length] = '\0'; /* 文字列の最後の' 'を'\0'にする */ | |
replace(dest, str); | |
print_data(dest, str); | |
/* 確保したメモリの解放 */ | |
free(str); | |
free(dest); | |
return 0; | |
} |
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