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diff --git a/662/CH4/EX4.21/ex4_21.JPG b/662/CH4/EX4.21/ex4_21.JPG
new file mode 100755
index 000000000..89ea255aa
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+++ b/662/CH4/EX4.21/ex4_21.JPG
diff --git a/662/CH4/EX4.21/ex4_21.sce b/662/CH4/EX4.21/ex4_21.sce
new file mode 100755
index 000000000..05ae3e6c9
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+                //Example 4.21
+//use of the minimum field width feature using g-type conversion
+i = 12345;
+x = 345.678;
+printf("%3d  %5d %8d\n\n", i, i, i);
+printf("%3g %10g %13g\n\n", x, x, x);
+printf("%3g %13g %16g", x, x, x);
+\ No newline at end of file