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1.1 ! root 1: main() ! 2: { ! 3: int i; char *s; ! 4: ! 5: for (s = "bfnrtvx"; *s; s++) ! 6: printf("%c = 0x%x\n", *s, backslash(*s)); ! 7: f(); ! 8: g(); ! 9: h(); ! 10: for (i = 0x1000000; i&0x7000000; i += 0x1000000) ! 11: big(i); ! 12: limit(); ! 13: return 0; ! 14: } ! 15: ! 16: backslash(c) ! 17: { ! 18: switch (c) { ! 19: case 'b': ! 20: return '\b'; ! 21: case 'f': ! 22: return '\f'; ! 23: case 'n': ! 24: return '\n'; ! 25: case 'r': ! 26: return '\r'; ! 27: case 't': ! 28: return '\t'; ! 29: case 'v': ! 30: return '\v'; ! 31: } ! 32: return c; ! 33: } ! 34: ! 35: f() { ! 36: int i, x = 0, y; ! 37: ! 38: printf("f:\n"); ! 39: for (i = 0; i <= 20; i++) { ! 40: y = i; ! 41: switch (i) { ! 42: case 1: x = i; break; ! 43: case 2: x = i; break; ! 44: case 7: x = i; break; ! 45: case 8: x = i; break; ! 46: case 9: x = i; break; ! 47: case 16: x = i; break; ! 48: case 17: x = i; break; ! 49: case 18: x = i; break; ! 50: case 19: x = i; break; ! 51: case 20: x = i; break; ! 52: } ! 53: printf("x = %d\n", x); ! 54: } ! 55: } ! 56: ! 57: g() { ! 58: int i; ! 59: ! 60: printf("g:\n"); ! 61: for (i = 1; i <= 10; i++) ! 62: switch (i) { ! 63: case 1: case 2: printf("1 %d\n", i); break; ! 64: case 3: case 4: case 5: printf("2 %d\n", i); break; ! 65: case 6: case 7: case 8: printf("3 %d\n", i); ! 66: default: ! 67: printf("d %d\n", i); break; ! 68: case 1001: case 1002: case 1003: case 1004: ! 69: printf("5 %d\n", i); break; ! 70: case 3001: case 3002: case 3003: case 3004: ! 71: printf("6 %d\n", i); break; ! 72: } ! 73: } ! 74: ! 75: h() ! 76: { ! 77: int i, n=0; ! 78: ! 79: printf("h:\n"); ! 80: for (i = 1; i <= 500; i++) ! 81: switch (i) { ! 82: default: n++; continue; ! 83: case 128: printf("i = %d\n", i); break; ! 84: case 16: printf("i = %d\n", i); break; ! 85: case 8: printf("i = %d\n", i); break; ! 86: case 120: printf("i = %d\n", i); break; ! 87: case 280: printf("i = %d\n", i); break; ! 88: case 264: printf("i = %d\n", i); break; ! 89: case 248: printf("i = %d\n", i); break; ! 90: case 272: printf("i = %d\n", i); break; ! 91: case 304: printf("i = %d\n", i); break; ! 92: case 296: printf("i = %d\n", i); break; ! 93: case 288: printf("i = %d\n", i); break; ! 94: case 312: printf("i = %d\n", i); break; ! 95: } ! 96: printf("%d defaults\n", n); ! 97: } ! 98: ! 99: big(x) unsigned x; { ! 100: switch(x&0x6000000){ ! 101: case -1: ! 102: case -2: ! 103: case 0x0000000: ! 104: printf("x = 0x%x\n", x); break; ! 105: case 0x2000000: ! 106: printf("x = 0x%x\n", x); break; ! 107: case 0x4000000: ! 108: printf("x = 0x%x\n", x); break; ! 109: default: ! 110: printf("x = 0x%x (default)\n", x); break; ! 111: } ! 112: } ! 113: ! 114: #include <limits.h> ! 115: ! 116: limit() { ! 117: int i; ! 118: ! 119: for (i = INT_MIN; i <= INT_MIN+5; i++) ! 120: switch (i) { ! 121: case INT_MIN: printf("0\n"); break; ! 122: case INT_MIN+1: printf("1\n"); break; ! 123: case INT_MIN+2: printf("2\n"); break; ! 124: case INT_MIN+3: printf("3\n"); break; ! 125: case INT_MIN+4: printf("4\n"); break; ! 126: default: printf("5\n"); break; ! 127: } ! 128: for (i = INT_MAX; i >= INT_MAX-5; i--) ! 129: switch (i) { ! 130: case INT_MAX: printf("0\n"); break; ! 131: case INT_MAX-1: printf("1\n"); break; ! 132: case INT_MAX-2: printf("2\n"); break; ! 133: case INT_MAX-3: printf("3\n"); break; ! 134: case INT_MAX-4: printf("4\n"); break; ! 135: default: printf("5\n"); break; ! 136: } ! 137: }
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