#include <stdio.h>
int main(void) {
char letter[26];
letter[0] = 'a';
for (int i = 1; i < 26; i++) {
letter[i] = letter[i - 1] + 1;
}
for (int i = 0; i < 26; i++) {
printf("%c", letter[i]);
}
return 0;
}
6-2
#include <stdio.h>
int main(void) {
for (int i = 1; i < 6; i++) {
for (int j = 1; j <= i; j++) {
printf("$");
}
printf("\n");
}
return 0;
}
6-3
#include <stdio.h>
int main(void) {
int i, j;
for (i = 1; i <= 6; i++) {
for (char f = 'F', j = 0; j < i; j++,f--) {
//f = f - 1;
printf("%c", f);
}
printf("\n");
}
return 0;
}
6-4
#include <stdio.h>
int main(void) {
int i, j;
char a = 'A';
for (i = 1; i <= 6; i++) {
for (j = 0; j < i; j++,a++) {
printf("%c", a);
}
printf("\n");
}
return 0;
}
6-5
#include <stdio.h>
#define A 'A'
int main(void) {
char ch;
char tem;
printf("请输入一个大写字母:");
scanf("%c", &ch);
int row = ch - A + 1;
for (int i = 1; i <= row; i++) {
//char tem;
for (int j = 0; j < row - i; j++) { //左边的空格
printf(" ");
}
for (int j = 0; j < i; j++) {//左边的字母
tem = A + j;
printf("%c", tem);
}
for (int j = 1; j < i; j++) {//右边的字母
tem = tem - 1;
printf("%c", tem);
}
printf("\n");
}
return 0;
}
6-6
#include <stdio.h>
int main(void) {
int min_num, max_num;
/*printf("请输入表格的上下限:");
scanf("%d%d", &max_num, &min_num);*/
printf("请输入表格的上限(最大值):");
scanf("%d", &max_num);
printf("请输入表格的下限(最小值):");
scanf("%d", &min_num);
for (int i = min_num; i <= max_num; i++) {
printf("%d\t%d\t%d\n", i, i * i, i * i * i);
}
return 0;
}
6-7
#include <stdio.h>
#include <string.h>
int main(void) {
char str[20];
int sz;
printf("请输入一个单词:");
scanf("%s", str);//scanf无法接收带空格的字符串
sz = strlen(str);
for (int i = sz - 1; i >= 0; i--) {
printf("%c", str[i]);
}
return 0;
}
6-8
#include <stdio.h>
int main(void) {
float f1, f2;
printf("请输入两个浮点数:");
int ret = scanf("%f %f", &f1, &f2);
while (ret == 2) {
printf("两数之差/两数乘积 = %f\n", (f1 - f2) / (f1 * f2));
printf("请输入两个浮点数(输入q退出程序):");
ret = scanf("%f %f", &f1, &f2);
}
printf("Done!");
return 0;
}
#include <stdio.h>
int main(void) {
int min_num, max_num;
printf("Enter lower and upper integer limits:");
scanf("%d %d", &min_num, &max_num);
while (max_num > min_num) {
int sum = 0;//不要忘记初始化!
for (int i = min_num; i <= max_num; i++) {
sum = i * i + sum;
}
printf("The sums of the squares from %d to %d is %d\n", min_num * min_num, max_num * max_num, sum);
printf("Enter next set of limits:");
scanf("%d %d", &min_num, &max_num);
}
printf("Done!");
return 0;
}
6-11
#include <stdio.h>
int main(void) {
int num[8];
printf("请输入8个整数:");
for (int i = 0; i < 8; i++) {
scanf("%d", &num[i]);
}
for (int j = 0; j < 8; j++) {
printf("%d\t", num[7 - j]);
}
return 0;
}
6-12
#include <stdio.h>
int main(void) {
int num;
float sum1 = 0.0;
float sum2 = 0.0;
printf("请输入项数:");
scanf("%d", &num);
while (num > 0) {
for (int i = 1; i <= num; i++) {
sum1 = sum1 + 1.0 / i;
}
printf("sum1 = %f\n", sum1);
for (int i = 1; i <= num; i++) {
if (i % 2 == 0) {
sum2 = sum2 - 1.0 / i;
}
else {
sum2 = sum2 + 1.0 / i;
}
}
printf("sum2 = %f\n", sum2);
printf("请输入项数(输入0退出程序):");
scanf("%d", &num);
}
printf("Done!");
return 0;
}
6-13
#include <stdio.h>
int main(void) {
int num[8];
num[0] = 2;
int j = 0;
for (int i = 1; i < 8; i++) {
num[i] = 2 * num[i - 1];
}
do {
printf("%d\t", num[j]);
j++;
} while (j < 8);
return 0;
}
6-14
#include <stdio.h>
int main(void) {
double num[8];
double sum[8];
int sum8 = 0;
printf("请输入8个数:");
for (int i = 0; i < 8; i++) {
scanf("%lf", &num[i]);
}
for (int j = 0; j < 8; j++) {
sum8 = sum8 + num[j];
sum[j] = sum8;
}
for (int i = 0; i < 8; i++) {
printf("%lf\t", num[i]);
}
printf("\n");
for (int i = 0; i < 8; i++) {
printf("%lf\t", sum[i]);
}
return 0;
}
6-15
#include <stdio.h>
#include <string.h>
int main(void) {
char input[256];
printf("请输入一行字符串:");
int i = 0;
do {
scanf("%c", &input[i]);
} while (input[i] != '\n' && ++i);//此时结束i下标为最后一个\n处
for (--i; i >= 0; i--) {//让i先落到字符串最后一个字符处
printf("%c", input[i]);
}
return 0;
}