C语言程序设计第4章 键盘输入和屏幕输出.pptVIP

#include stdio.h main() { int data1, data2, sum; char op; printf(Please enter the expression data1 + data2\n); scanf(%d%c%d,data1, op, data2); printf(%d%c%d = %d\n, data1, op, data2, data1+data2); } Please enter the expression data1 + data2 第3次测试 12+3↙ 12+3 = 15 C格式符的问题及解决—例4.5 #include stdio.h main() { int a; char b; float c; printf(Please input an integer:); scanf(%d, a); printf(integer: %d\n, a); printf(Please input a character:); scanf(%c, b); printf(character: %c\n, b); printf(Please input a float number:); scanf(%f, c); printf(float: %f\n, c); } Please input an integer: 希望得到的运行结果 12↙ Please input an character : a↙ Please input a float number: 3.5↙ integer:12 character :a float number:3.500000 C格式符的问题及解决—例4.6 #include stdio.h main() { int a; char b; float c; printf(Please input an integer:); scanf(%d, a); printf(integer: %d\n, a); printf(Please input a character:); scanf(%c, b); printf(character: %c\n, b); printf(Please input a float number:); scanf(%f, c); printf(float: %f\n, c); } Please input an integer: 结果好像很奇怪呀！ 12↙ Please input an character : a↙ Please input a float number: 3.5↙ integer:12 float number:3.500000 C格式符的问题及解决—例4.6 #include stdio.h main() { int a; char b; float c; printf(Please input an integer:); scanf(%d, a); printf(integer: %d\n, a); printf(Please input a character:); getchar(); /*将存于缓冲区中的回车字符读入，避免被后面的变量作为有效字符读入*/ scanf(%c, b); printf(character: %c\n, b); printf(Please input a float number:); scanf(%f, c); printf(float: %f\n, c); } Please input an integer: 程序修改后得到的运行结果 12↙ Please input an character : a↙ Please input a float number: 3.5↙ integer:12 character :a float number:3.500000 C格式符的问题及解决—例4.6 #include stdio.h main() { int a; char b; float c; printf(Please input an integer:);