11 files changed, 177 insertions, 0 deletions
diff --git a/src/c/__Makefile__ b/src/c/_Makefile
index d6e2bf1..d6e2bf1 100644
--- a/src/c/__Makefile__
+++ b/src/c/_Makefile
diff --git a/src/c/exercise1/Makefile b/src/c/exercise1/Makefile
new file mode 100644
index 0000000..9a5793b
--- /dev/null
+++ b/src/c/exercise1/Makefile
@@ -0,0 +1,30 @@
+# Minimal Makefile to compile count.c into an executable named main
+
+# Compiler
+CC = gcc
+
+
+# Flags
+CFLAGS = -Wall -Wextra -O2
+
+
+# Default target
+# Tells make what dependencies to compile
+all: count
+
+
+# Dependency 'count'
+# count.c is the source file
+count: count.c
+	$(CC) $(CFLAGS) -o count count.c
+
+
+# Test target 
+test: count
+	@echo -n "count.c test............................"
+	@./count >/dev/null 2>&1 && echo "OK" || echo "FAILED"
+
+
+# Clean target
+clean:
+	rm -f count
diff --git a/src/c/exercise1/count b/src/c/exercise1/count
new file mode 100755
index 0000000..3e40c87
--- /dev/null
+++ b/src/c/exercise1/count
diff --git a/src/c/exercise1/count.c b/src/c/exercise1/count.c
new file mode 100644
index 0000000..385fb71
--- /dev/null
+++ b/src/c/exercise1/count.c
@@ -0,0 +1,33 @@
+#include <stdio.h>
+
+int
+main()
+{
+    
+    int c, i, nwhite, nother;
+    int ndigit[10];
+
+    nwhite = nother = 0;
+
+    for (i = 0; i < 10; ++i)
+        ndigit[i] = 0;
+    
+    while ((c = getchar()) != EOF)
+        if (c >= '0' && c <= '9')
+        ++ndigit[c-'0'];
+    else if (c == ' ' || c == '\n' || c == '\t')
+        ++nwhite;
+    else
+        ++nother;
+    
+    printf("digits =");
+    
+    for (i = 0; i < 10; ++i)
+        printf(" %d", ndigit[i]);
+
+    printf(", white space = %d, other = %d\n",
+        nwhite, nother);
+
+    return 0;
+}
+
diff --git a/src/c/hello-c/Makefile b/src/c/hello-c/Makefile
new file mode 100644
index 0000000..876f118
--- /dev/null
+++ b/src/c/hello-c/Makefile
@@ -0,0 +1,30 @@
+# Minimal Makefile to compile hello.c into an executable named main
+
+# Compiler
+CC = gcc
+
+
+# Flags
+CFLAGS = -Wall -Wextra -O2
+
+
+# Default target
+# Tells make what dependencies to compile
+all: hello
+
+
+# Dependency 'hello'
+# hello.c is the source file
+hello: hello.c
+	$(CC) $(CFLAGS) -o hello hello.c
+
+
+# Test target 
+test: hello
+	@echo -n "hello.c test............................"
+	@./hello >/dev/null 2>&1 && echo "OK" || echo "FAILED"
+
+
+# Clean target
+clean:
+	rm -f hello
diff --git a/src/c/hello-c/Makefile_001.log b/src/c/hello-c/Makefile_001.log
new file mode 100644
index 0000000..282d1b5
--- /dev/null
+++ b/src/c/hello-c/Makefile_001.log
@@ -0,0 +1 @@
+make: Nothing to be done for 'all'.
diff --git a/src/c/hello-c/hello b/src/c/hello-c/hello
new file mode 100755
index 0000000..1d127b0
--- /dev/null
+++ b/src/c/hello-c/hello
diff --git a/src/c/hello-c/hello.c b/src/c/hello-c/hello.c
index c63efdb..4aff095 100644
--- a/src/c/hello-c/hello.c
+++ b/src/c/hello-c/hello.c
@@ -1,6 +1,9 @@
 #include <stdio.h>
 
+int
 main()
 {
     printf("Hello C\n");
+
+    return 0;
 }
diff --git a/src/c/sizeof/Makefile b/src/c/sizeof/Makefile
new file mode 100644
index 0000000..d6e2bf1
--- /dev/null
+++ b/src/c/sizeof/Makefile
@@ -0,0 +1,30 @@
+# Minimal Makefile to compile main.c into an executable named main
+
+# Compiler
+CC = gcc
+
+
+# Flags
+CFLAGS = -Wall -Wextra -O2
+
+
+# Default target
+# Tells make what dependencies to compile
+all: main
+
+
+# Dependency 'main'
+# main.c is the source file
+main: main.c
+	$(CC) $(CFLAGS) -o main main.c
+
+
+# Test target 
+test: main
+	@echo -n "main.c test............................"
+	@./main >/dev/null 2>&1 && echo "OK" || echo "FAILED"
+
+
+# Clean target
+clean:
+	rm -f main
diff --git a/src/c/sizeof/main b/src/c/sizeof/main
new file mode 100755
index 0000000..d902a63
--- /dev/null
+++ b/src/c/sizeof/main
diff --git a/src/c/sizeof/main.c b/src/c/sizeof/main.c
new file mode 100644
index 0000000..0d16080
--- /dev/null
+++ b/src/c/sizeof/main.c
@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdint.h>    // for fixed-width integer types
+#include <stddef.h>    // for size_t, ptrdiff_t
+#include <limits.h>    // for limits of fundamental types
+#include <inttypes.h>  // for PRId64 macros etc.
+
+int main(void) {
+    printf("=== Fundamental integer types ===\n");
+    printf("char       : %zu byte(s) (%zu bit)  range: %d to %d\n",
+           sizeof(char), sizeof(char) * 8, CHAR_MIN, CHAR_MAX);
+    printf("short      : %zu byte(s) (%zu bit)  range: %d to %d\n",
+           sizeof(short), sizeof(short) * 8, SHRT_MIN, SHRT_MAX);
+    printf("int        : %zu byte(s) (%zu bit)  range: %d to %d\n",
+           sizeof(int), sizeof(int) * 8, INT_MIN, INT_MAX);
+    printf("long       : %zu byte(s) (%zu bit)  range: %ld to %ld\n",
+           sizeof(long), sizeof(long) * 8, LONG_MIN, LONG_MAX);
+    printf("long long  : %zu byte(s) (%zu bit)  range: %lld to %lld\n",
+           sizeof(long long), sizeof(long long) * 8, LLONG_MIN, LLONG_MAX);
+
+    printf("\n=== Fixed-width integer types (from <stdint.h>) ===\n");
+    printf("int8_t     : %zu byte(s) (%zu bit)  range: %" PRId8 " to %" PRId8 "\n",
+           sizeof(int8_t), sizeof(int8_t) * 8, INT8_MIN, INT8_MAX);
+    printf("int16_t    : %zu byte(s) (%zu bit)  range: %" PRId16 " to %" PRId16 "\n",
+           sizeof(int16_t), sizeof(int16_t) * 8, INT16_MIN, INT16_MAX);
+    printf("int32_t    : %zu byte(s) (%zu bit)  range: %" PRId32 " to %" PRId32 "\n",
+           sizeof(int32_t), sizeof(int32_t) * 8, INT32_MIN, INT32_MAX);
+    printf("int64_t    : %zu byte(s) (%zu bit)  range: %" PRId64 " to %" PRId64 "\n",
+           sizeof(int64_t), sizeof(int64_t) * 8, INT64_MIN, INT64_MAX);
+
+    printf("\n=== Unsigned fixed-width types ===\n");
+    printf("uint8_t    : %zu byte(s) (%zu bit)  range: 0 to %" PRIu8 "\n",
+           sizeof(uint8_t), sizeof(uint8_t) * 8, UINT8_MAX);
+    printf("uint16_t   : %zu byte(s) (%zu bit)  range: 0 to %" PRIu16 "\n",
+           sizeof(uint16_t), sizeof(uint16_t) * 8, UINT16_MAX);
+    printf("uint32_t   : %zu byte(s) (%zu bit)  range: 0 to %" PRIu32 "\n",
+           sizeof(uint32_t), sizeof(uint32_t) * 8, UINT32_MAX);
+    printf("uint64_t   : %zu byte(s) (%zu bit)  range: 0 to %" PRIu64 "\n",
+           sizeof(uint64_t), sizeof(uint64_t) * 8, UINT64_MAX);
+
+    printf("\n=== Pointer and memory-related types ===\n");
+    printf("void*      : %zu byte(s) (%zu bit)\n",
+           sizeof(void*), sizeof(void*) * 8);
+    printf("size_t     : %zu byte(s) (%zu bit)  range: 0 to %zu\n",
+           sizeof(size_t), sizeof(size_t) * 8, (size_t)-1);
+    printf("ptrdiff_t  : %zu byte(s) (%zu bit)\n",
+           sizeof(ptrdiff_t), sizeof(ptrdiff_t) * 8);
+
+    return 0;
+}
+