added cls05

src/cls05/Makefile

@@ -0,0 +1,14 @@
+include ../common.mk
+
+PROJECT_NAME:=cls05
+
+TGTS:=$(patsubst %.c,%,$(wildcard *.c))
+
+all: $(TGTS)
+
+%: %.c
+	@mkdir -p $(BUILD_PATH)/$(PROJECT_NAME)
+	$(CC) $(CFLAGS) -I. $^ -o $(BUILD_PATH)/$(PROJECT_NAME)/$@
+
+clean:
+	$(RM) -drf $(BUILD_PATH)/$(PROJECT_NAME)

src/cls05/a1.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+
+#define BUFF_SZ 256
+
+int str_char(const char s[], int c) {
+    int idx = 0;
+    while (s[idx] != '\0') {
+        if (s[idx] == (char)c) {
+            return idx + 1;
+        }
+        idx++;
+    }
+
+    return -1;
+}
+
+int main(void) {
+    char buff[BUFF_SZ] = {0};
+    char query = 0;
+    
+    printf("Input String: ");
+    fgets(buff, BUFF_SZ, stdin);
+
+    printf("Input Search Character: ");
+    scanf("%c", &query);
+
+    printf("%c, %s\n", query, buff);
+
+    int ret = str_char(buff, query);
+    if (ret != -1) {
+        printf("Found %c at %d\n", query, ret);
+    } else {
+        printf("Queried character not found.\n");
+    }
+
+    return 0;
+}
+

src/cls05/a2.c

@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+#define BUFF_SZ 256
+
+int main(void) {
+    char buff[BUFF_SZ] = {0};
+    int cnt = 0;
+
+    printf("Input String: ");
+    while ((buff[cnt] = getchar()) != '\n') {
+        cnt++;
+    };
+    buff[cnt] = '\0';
+
+    int i = 0;
+    while (buff[i] != '\0') {
+        printf(
+            "Char: %c, ASCII Code: 0x%X (%d)\n",
+            buff[i], (int)buff[i], (int)buff[i]
+        );
+        i++;
+    }
+
+    return 0;
+}

src/cls05/a3.c

@@ -0,0 +1,34 @@
+#include <stdio.h>
+
+#define BUFF_SZ 256
+
+void rev_string(char s[]) {
+    int str_sz = 0;
+    char tmp = 0;
+
+    do {
+        str_sz++;
+    } while (s[str_sz] != '\0' && str_sz < BUFF_SZ);
+    str_sz--; // remove null terminater from count
+
+    for (int i = 0; i < str_sz/2; i++) {
+        tmp = s[str_sz - 1 - i];
+        s[str_sz - 1 - i] = s[i];
+        s[i] = tmp;
+    }
+}
+
+int main(void) {
+    char buff[BUFF_SZ] = {0};
+
+    printf("Input String: ");
+    fgets(buff, BUFF_SZ, stdin);
+
+    printf("Got: %s\n", buff);
+
+    rev_string(buff);
+
+    printf("Rev: %s\n", buff);
+
+    return 0;
+}