#include <stdio.h>
int main (){
  printf("things I wan't to do.\n");
  char a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z;
  scanf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", &a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t, &u, &v, &w, &x, &y, &z);
  printf(" •%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z);
  float x11 = a + b + c + d + e + f + g + h + i + j + k + l + m + n + o + p + q + r + s + t + u + v + w + x + y + z;
char a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2;
  scanf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", &a2, &b2, &c2, &d2, &e2, &f2, &g2, &h2, &i2, &j2, &k2, &l2, &m2, &n2, &o2, &p2, &q2, &r2, &s2, &t2, &u2, &v2, &w2, &x2, &y2, &z2);
  printf(" •%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2);
char a3, b3, c3, d3, e3, f3, g3, h3, i3, j3, k3, l3, m3, n3, o3, p3, q3, r3, s3, t3, u3, v3, w3, x3, y3, z3;
  scanf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", &a3, &b3, &c3, &d3, &e3, &f3, &g3, &h3, &i3, &j3, &k3, &l3, &m3, &n3, &o3, &p3, &q3, &r3, &s3, &t3, &u3, &v3, &w3, &x3, &y3, &z3);
  printf(" •%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", a3, b3, c3, d3, e3, f3, g3, h3, i3, j3, k3, l3, m3, n3, o3, p3, q3, r3, s3, t3, u3, v3, w3, x3, y3, z3);
char a4, b4, c4, d4, e4, f4, g4, h4, i4, j4, k4, l4, m4, n4, o4, p4, q4, r4, s4, t4, u4, v4, w4, x4, y4, z4;
  scanf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", &a4, &b4, &c4, &d4, &e4, &f4, &g4, &h4, &i4, &j4, &k4, &l4, &m4, &n4, &o4, &p4, &q4, &r4, &s4, &t4, &u4, &v4, &w4, &x4, &y4, &z4);
  printf(" •%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", a4, b4, c4, d4, e4, f4, g4, h4, i4, j4, k4, l4, m4, n4, o4, p4, q4, r4, s4, t4, u4, v4, w4, x4, y4, z4);
char a5, b5, c5, d5, e5, f5, g5, h5, i5, j5, k5, l5, m5, n5, o5, p5, q5, r5, s5, t5, u5, v5, w5, x5, y5, z5;
  scanf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", &a5, &b5, &c5, &d5, &e5, &f5, &g5, &h5, &i5, &j5, &k5, &l5, &m5, &n5, &o5, &p5, &q5, &r5, &s5, &t5, &u5, &v5, &w5, &x5, &y5, &z5);
  printf(" •%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", a5, b5, c5, d5, e5, f5, g5, h5, i5, j5, k5, l5, m5, n5, o5, p5, q5, r5, s5, t5, u5, v5, w5, x5, y5, z5);
  printf("things I need to do.\n");
char a6, b6, c6, d6, e6, f6, g6, h6, i6, j6, k6, l6, m6, n6, o6, p6, q6, r6, s6, t6, u6, v6, w6, x6, y6, z6;
  scanf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", &a6, &b6, &c6, &d6, &e6, &f6, &g6, &h6, &i6, &j6, &k6, &l6, &m6, &n6, &o6, &p6, &q6, &r6, &s6, &t6, &u6, &v6, &w6, &x6, &y6, &z6);
  printf(" •%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", a6, b6, c6, d6, e6, f6, g6, h6, i6, j6, k6, l6, m6, n6, o6, p6, q6, r6, s6, t6, u6, v6, w6, x6, y6, z6);
char a7, b7, c7, d7, e7, f7, g7, h7, i7, j7, k7, l7, m7, n7, o7, p7, q7, r7, s7, t7, u7, v7, w7, x7, y7, z7;
  scanf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", &a7, &b7, &c7, &d7, &e7, &f7, &g7, &h7, &i7, &j7, &k7, &l7, &m7, &n7, &o7, &p7, &q7, &r7, &s7, &t7, &u7, &v7, &w7, &x7, &y7, &z7);
  printf(" •%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", a7, b7, c7, d7, e7, f7, g7, h7, i7, j7, k7, l7, m7, n7, o7, p7, q7, r7, s7, t7, u7, v7, w7, x7, y7, z7);
char a8, b8, c8, d8, e8, f8, g8, h8, i8, j8, k8, l8, m8, n8, o8, p8, q8, r8, s8, t8, u8, v8, w8, x8, y8, z8;
  scanf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", &a8, &b8, &c8, &d8, &e8, &f8, &g8, &h8, &i8, &j8, &k8, &l8, &m8, &n8, &o8, &p8, &q8, &r8, &s8, &t8, &u8, &v8, &w8, &x8, &y8, &z8);
  printf(" •%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", a8, b8, c8, d8, e8, f8, g8, h8, i8, j8, k8, l8, m8, n8, o8, p8, q8, r8, s8, t8, u8, v8, w8, x8, y8, z8);
char a9, b9, c9, d9, e9, f9, g9, h9, i9, j9, k9, l9, m9, n9, o9, p9, q9, r9, s9, t9, u9, v9, w9, x9, y9, z9;
  scanf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", &a9, &b9, &c9, &d9, &e9, &f9, &g9, &h9, &i9, &j9, &k9, &l9, &m9, &n9, &o9, &p9, &q9, &r9, &s9, &t9, &u9, &v9, &w9, &x9, &y9, &z9);
  printf(" •%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", a9, b9, c9, d9, e9, f9, g9, h9, i9, j9, k9, l9, m9, n9, o9, p9, q9, r9, s9, t9, u9, v9, w9, x9, y9, z9);
char a10, b10, c10, d10, e10, f10, g10, h10, i10, j10, k10, l10, m10, n10, o10, p10, q10, r10, s10, t10, u10, v10, w10, x10, y10, z10;
  scanf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", &a10, &b10, &c10, &d10, &e10, &f10, &g10, &h10, &i10, &j10, &k10, &l10, &m10, &n10, &o10, &p10, &q10, &r10, &s10, &t10, &u10, &v10, &w10, &x10, &y10, &z10);
  printf(" •%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n", a10, b10, c10, d10, e10, f10, g10, h10, i10, j10, k10, l10, m10, n10, o10, p10, q10, r10, s10, t10, u10, v10, w10, x10, y10, z10);
printf("%f", x11);
}

C Language online compiler

Write, Run & Share C Language code online using OneCompiler's C online compiler for free. It's one of the robust, feature-rich online compilers for C language, running the latest C version which is C18. Getting started with the OneCompiler's C editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'C' and start coding!

Read inputs from stdin

OneCompiler's C online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.

#include <stdio.h>
int main()
{
    char name[50];
    printf("Enter name:");
    scanf("%s", name);
    printf("Hello %s \n" , name );
    return 0;
    
}

About C

C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.

Key features:

  • Structured Programming
  • Popular system programming language
  • UNIX, MySQL and Oracle are completely written in C.
  • Supports variety of platforms
  • Efficient and also handle low-level activities.
  • As fast as assembly language and hence used as system development language.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition if-else is used.

if(conditional-expression) {
   // code
} else {
   // code
}

You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to if-else-if ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {  
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Two types of functions are present in C

  1. Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

  1. User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

How to declare a Function

return_type function_name(parameters);

How to call a Function

function_name (parameters)

How to define a Function

return_type function_name(parameters) {  
  //code
}